diff --git a/.env.template b/.env.template
index 51bb9e0f..421cb0c2 100644
--- a/.env.template
+++ b/.env.template
@@ -10,6 +10,10 @@
 # ICON_CACHE_FOLDER=data/icon_cache
 # ATTACHMENTS_FOLDER=data/attachments
 
+## Templates data folder, by default uses embedded templates
+## Check source code to see the format
+# TEMPLATES_FOLDER=/path/to/templates
+
 ## Cache time-to-live for successfully obtained icons, in seconds (0 is "forever")
 # ICON_CACHE_TTL=2592000
 ## Cache time-to-live for icons which weren't available, in seconds (0 is "forever")
diff --git a/Cargo.lock b/Cargo.lock
index b91c591b..22ae11d7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,6 +34,11 @@ name = "antidote"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "arrayref"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "arrayvec"
 version = "0.4.10"
@@ -119,6 +124,7 @@ dependencies = [
  "diesel_migrations 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "dotenv 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fern 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "handlebars 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonwebtoken 5.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lettre 0.9.0 (git+https://github.com/lettre/lettre?rev=c988b1760ad81)",
@@ -145,6 +151,15 @@ dependencies = [
  "yubico 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.7.0"
@@ -200,6 +215,11 @@ name = "byte-tools"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "byte-tools"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byte-tools"
 version = "0.3.0"
@@ -445,6 +465,14 @@ dependencies = [
  "generic-array 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "digest"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "digest"
 version = "0.8.0"
@@ -689,6 +717,14 @@ dependencies = [
  "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.12.0"
@@ -719,6 +755,22 @@ dependencies = [
  "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "handlebars"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pest 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pest_derive 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hmac"
 version = "0.1.1"
@@ -1028,6 +1080,11 @@ dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "maplit"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "matches"
 version = "0.1.8"
@@ -1422,6 +1479,45 @@ name = "percent-encoding"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "pest"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ucd-trie 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pest_derive"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "pest 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pest_generator 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pest_generator"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "pest 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pest_meta 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pest_meta"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pest 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha-1 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "phf"
 version = "0.7.24"
@@ -1965,6 +2061,17 @@ dependencies = [
  "generic-array 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sha-1"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sha-1"
 version = "0.8.1"
@@ -2329,6 +2436,11 @@ dependencies = [
  "webpki 0.18.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ucd-trie"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "ucd-util"
 version = "0.1.3"
@@ -2576,6 +2688,7 @@ dependencies = [
 "checksum aes-soft 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "cfd7e7ae3f9a1fb5c03b389fc6bb9a51400d0c13053f0dca698c832bfd893a0d"
 "checksum aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e9a933f4e58658d7b12defcf96dc5c720f20832deebe3e0a19efd3b6aaeeb9e"
 "checksum antidote 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34fde25430d87a9388dadbe6e34d7f72a462c8b43ac8d309b42b0a8505d7e2a5"
+"checksum arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
 "checksum arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "92c7fb76bc8826a8b33b4ee5bb07a247a81e76764ab4d55e8f73e3a4d8808c71"
 "checksum ascii 0.8.7 (registry+https://github.com/rust-lang/crates.io-index)" = "97be891acc47ca214468e09425d02cef3af2c94d0d82081cd02061f996802f14"
 "checksum ascii_utils 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "71938f30533e4d95a6d17aa530939da3842c2ab6f4f84b9dae68447e4129f74a"
@@ -2586,6 +2699,7 @@ dependencies = [
 "checksum base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "489d6c0ed21b11d038c31b6ceccca973e65d73ba3bd8ecb9a2babf5546164643"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
+"checksum block-buffer 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a076c298b9ecdb530ed9d967e74a6027d6a7478924520acddcddc24c1c8ab3ab"
 "checksum block-buffer 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "49665c62e0e700857531fa5d3763e91b539ff1abeebd56808d378b495870d60d"
 "checksum block-cipher-trait 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1c924d49bd09e7c06003acda26cd9742e796e34282ec6c1189404dee0c1f4774"
 "checksum block-modes 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d90b1e3da95151ddacfa78aa46d1a9173e28a8a11625102e088562d3407bf3b9"
@@ -2593,6 +2707,7 @@ dependencies = [
 "checksum buf_redux 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "72f25c67abbf523ff8457771622fb731ac4a2391439de33bc60febcdee1749c9"
 "checksum bufstream 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "40e38929add23cdf8a366df9b0e088953150724bcbe5fc330b0d8eb3b328eec8"
 "checksum byte-tools 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0919189ba800c7ffe8778278116b7e0de3905ab81c72abb69c85cbfef7991279"
+"checksum byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40"
 "checksum byte-tools 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "980479e6fde23246dfb54d47580d66b4e99202e7579c5eaa9fe10ecb5ebd2182"
 "checksum byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "94f88df23a25417badc922ab0f5716cc1330e87f71ddd9203b3a3ccd9cedf75d"
 "checksum bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "40ade3d27603c2cb345eb0912aec461a6dec7e06a4ae48589904e808335c7afa"
@@ -2622,6 +2737,7 @@ dependencies = [
 "checksum diesel_derives 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "03bcaf77491f53e400d5ee3bdd57142ea4e1c47fe9217b3361ff9a76ca0e3d37"
 "checksum diesel_migrations 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "17b42c35d1ce9e8d57a3e7001b4127f2bc1b073a89708bb7019f5be27c991c28"
 "checksum digest 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7a68d759d7a66a4f63d5bd2a2b14ad7e8cf93fe8c9be227031cd4e72ab0e9ee8"
+"checksum digest 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "03b072242a8cbaf9c145665af9d250c59af3b958f83ed6824e13533cf76d5b90"
 "checksum digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05f47366984d3ad862010e22c7ce81a7dbcaebbdfb37241a620f8b6596ee135c"
 "checksum digest-buffer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4eb92364e9f6d3da159257250532d448b218406d2acb149f724e8f48e9f5cb9a"
 "checksum dotenv 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c0d0a1279c96732bc6800ce6337b6a614697b0e74ae058dc03c62ebeb78b4d86"
@@ -2653,8 +2769,10 @@ dependencies = [
 "checksum futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "ab90cde24b3319636588d0c35fe03b1333857621051837ed769faefb4c2162e4"
 "checksum generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c0f28c2f5bfb5960175af447a2da7c18900693738343dc896ffbcabd9839592"
 "checksum generic-array 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "dbe043cf9b85297937897087de81f590361686e1ac2d4d471b45435de5dfb6a6"
+"checksum generic-array 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef25c5683767570c2bbd7deba372926a55eaae9982d7726ee2a1050239d45b9d"
 "checksum groupable 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "32619942b8be646939eaf3db0602b39f5229b74575b67efc897811ded1db4e57"
 "checksum h2 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "1ac030ae20dee464c5d0f36544d8b914a6bc606da44a57e052d2b0f5dae129e0"
+"checksum handlebars 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d82e5750d8027a97b9640e3fefa66bbaf852a35228e1c90790efd13c4b09c166"
 "checksum hmac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bdb5aa9647ba4711e9d6968dc1c810cd23989ed435443ca962e1bf6d8b8b83ff"
 "checksum hmac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f127a908633569f208325f86f71255d3363c79721d7f9fe31cd5569908819771"
 "checksum hostname 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "21ceb46a83a85e824ef93669c8b390009623863b5c195d1ba747292c0c72f94e"
@@ -2685,6 +2803,7 @@ dependencies = [
 "checksum lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "62ebf1391f6acad60e5c8b43706dde4582df75c06698ab44511d15016bc2442c"
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
+"checksum maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "08cbb6b4fef96b6d77bfc40ec491b1690c779e77b05cd9f07f787ed376fd4c43"
 "checksum matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 "checksum memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "db4c41318937f6e76648f42826b1d9ade5c09cafb5aef7e351240a70f39206e9"
 "checksum memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0f9dc261e2b62d7a622bf416ea3c5245cdd5d9a7fcc428c0d06804dfce1775b3"
@@ -2725,6 +2844,10 @@ dependencies = [
 "checksum pear 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c26d2b92e47063ffce70d3e3b1bd097af121a9e0db07ca38a6cc1cf0cc85ff25"
 "checksum pear_codegen 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "336db4a192cc7f54efeb0c4e11a9245394824cc3bcbd37ba3ff51240c35d7a6e"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
+"checksum pest 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "54f0c72a98d8ab3c99560bfd16df8059cc10e1f9a8e83e6e3b97718dd766e9c3"
+"checksum pest_derive 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "833d1ae558dc601e9a60366421196a8d94bc0ac980476d0b67e1d0988d72b2d0"
+"checksum pest_generator 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63120576c4efd69615b5537d3d052257328a4ca82876771d6944424ccfd9f646"
+"checksum pest_meta 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f5a3492a4ed208ffc247adcdcc7ba2a95be3104f58877d0d02f0df39bf3efb5e"
 "checksum phf 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)" = "b3da44b85f8e8dfaec21adae67f95d93244b2ecf6ad2a692320598dcc8e6dd18"
 "checksum phf_codegen 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)" = "b03e85129e324ad4166b06b2c7491ae27fe3ec353af72e72cd1654c7225d517e"
 "checksum phf_generator 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)" = "09364cc93c159b8b06b1f4dd8a4398984503483891b0c26b867cf431fb132662"
@@ -2784,6 +2907,7 @@ dependencies = [
 "checksum serde_json 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)" = "dfb1277d4d0563e4593e0b8b5d23d744d277b55d2bc0bf1c38d0d8a6589d38aa"
 "checksum serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d48f9f99cd749a2de71d29da5f948de7f2764cc5a9d7f3c97e3514d4ee6eabf2"
 "checksum sha-1 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8347606816471548cd60f0abd5ef0d513a81f5202dbdab9c09f17a15b5248484"
+"checksum sha-1 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "51b9d1f3b5de8a167ab06834a7c883bd197f2191e1dda1a22d9ccfeedbf9aded"
 "checksum sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "23962131a91661d643c98940b20fcaffe62d776a823247be80a48fcb8b6fce68"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
 "checksum sha2 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "84920f9ac881e94e33ec89e1b3dcd36040523a308a92548e01217ce35d8cf6a8"
@@ -2824,6 +2948,7 @@ dependencies = [
 "checksum typemap 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "653be63c80a3296da5551e1bfd2cca35227e13cdd08c6668903ae2f4f77aa1f6"
 "checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
 "checksum u2f 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3c74b68bd3f67273d9d3161dbab8672a69df832a7fbcd1e2cd9b714063648ab5"
+"checksum ucd-trie 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "71a9c5b1fe77426cf144cc30e49e955270f5086e31a6441dfa8b32efc09b9d77"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7f4765f83163b74f957c797ad9253caf97f103fb064d3999aea9568d09fc8a33"
 "checksum unicase 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9d3218ea14b4edcaccfa0df0a64a3792a2c32cc706f1b336e48867f9d3147f90"
diff --git a/Cargo.toml b/Cargo.toml
index 71264870..18096d2f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -92,6 +92,9 @@ lettre = "0.9.0"
 lettre_email = "0.9.0"
 native-tls = "0.2.2"
 
+# Template library
+handlebars = "1.1.0"
+
 # Number encoding library
 byteorder = "1.2.7"
 
diff --git a/src/error.rs b/src/error.rs
index 6e5c627e..98a7d0e4 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -37,6 +37,7 @@ use jsonwebtoken::errors::Error as JwtError;
 use serde_json::{Error as SerError, Value};
 use std::io::Error as IOError;
 use u2f::u2ferror::U2fError as U2fErr;
+use handlebars::RenderError as HbError;
 
 // Error struct
 // Contains a String error message, meant for the user and an enum variant, with an error of different types.
@@ -53,6 +54,7 @@ make_error! {
     SerdeError(SerError): _has_source, _api_error,
     JWTError(JwtError):   _has_source, _api_error,
     IoErrror(IOError):    _has_source, _api_error,
+    TemplErrror(HbError): _has_source, _api_error,
     //WsError(ws::Error): _has_source, _api_error,
 }
 
diff --git a/src/mail.rs b/src/mail.rs
index eddbec1c..e41ec858 100644
--- a/src/mail.rs
+++ b/src/mail.rs
@@ -4,11 +4,11 @@ use lettre::{ClientSecurity, ClientTlsParameters, SmtpClient, SmtpTransport, Tra
 use lettre_email::EmailBuilder;
 use native_tls::{Protocol, TlsConnector};
 
+use crate::api::EmptyResult;
+use crate::auth::{encode_jwt, generate_invite_claims};
+use crate::error::Error;
 use crate::MailConfig;
 use crate::CONFIG;
-use crate::auth::{generate_invite_claims, encode_jwt};
-use crate::api::EmptyResult;
-use crate::error::Error;
 
 fn mailer(config: &MailConfig) -> SmtpTransport {
     let client_security = if config.smtp_ssl {
@@ -35,24 +35,32 @@ fn mailer(config: &MailConfig) -> SmtpTransport {
         .transport()
 }
 
-pub fn send_password_hint(address: &str, hint: Option<String>, config: &MailConfig) -> EmptyResult {
-    let (subject, body) = if let Some(hint) = hint {
-        (
-            "Your master password hint",
-            format!(
-                "You (or someone) recently requested your master password hint.\n\n\
-                 Your hint is:  \"{}\"\n\n\
-                 If you did not request your master password hint you can safely ignore this email.\n",
-                hint
-            ),
-        )
-    } else {
-        (
-            "Sorry, you have no password hint...",
-            "Sorry, you have not specified any password hint...\n".into(),
-        )
+fn get_text(template_name: &'static str, data: serde_json::Value) -> Result<(String, String), Error> {
+    let text = CONFIG.templates.render(template_name, &data)?;
+    let mut text_split = text.split("<!---------------->");
+
+    let subject = match text_split.next() {
+        Some(s) => s.trim().to_string(),
+        None => err!("Template doesn't contain subject"),
     };
 
+    let body = match text_split.next() {
+        Some(s) => s.trim().to_string(),
+        None => err!("Template doesn't contain body"),
+    };
+
+    Ok((subject, body))
+}
+
+pub fn send_password_hint(address: &str, hint: Option<String>, config: &MailConfig) -> EmptyResult {
+    let template_name = if hint.is_some() {
+        "email_pw_hint_some"
+    } else {
+        "email_pw_hint_none"
+    };
+
+    let (subject, body) = get_text(template_name, json!({ "hint": hint }))?;
+
     send_email(&address, &subject, &body, &config)
 }
 
@@ -66,74 +74,66 @@ pub fn send_invite(
     config: &MailConfig,
 ) -> EmptyResult {
     let claims = generate_invite_claims(
-                uuid.to_string(),
-                String::from(address),
-                org_id.clone(),
-                org_user_id.clone(),
-                invited_by_email.clone(),
-            );
+        uuid.to_string(),
+        String::from(address),
+        org_id.clone(),
+        org_user_id.clone(),
+        invited_by_email.clone(),
+    );
     let invite_token = encode_jwt(&claims);
-    let (subject, body) = {
-        (format!("Join {}", &org_name),
-        format!(
-            "<html>
-             <p>You have been invited to join the <b>{}</b> organization.<br><br>
-             <a href=\"{}/#/accept-organization/?organizationId={}&organizationUserId={}&email={}&organizationName={}&token={}\">
-             Click here to join</a></p>
-             <p>If you do not wish to join this organization, you can safely ignore this email.</p>
-             </html>",
-            org_name, CONFIG.domain, org_id.unwrap_or("_".to_string()), org_user_id.unwrap_or("_".to_string()), address, org_name, invite_token
-        ))
-    };
+
+    let (subject, body) = get_text(
+        "email_send_org_invite",
+        json!({
+            "url": CONFIG.domain,
+            "org_id": org_id.unwrap_or("_".to_string()),
+            "org_user_id": org_user_id.unwrap_or("_".to_string()),
+            "email": address,
+            "org_name": org_name,
+            "token": invite_token,
+        }),
+    )?;
 
     send_email(&address, &subject, &body, &config)
 }
 
-pub fn send_invite_accepted(
-    new_user_email: &str,
-    address: &str,
-    org_name: &str,
-    config: &MailConfig,
-) -> EmptyResult {
-    let (subject, body) = {
-        ("Invitation accepted",
-        format!(
-            "<html>
-             <p>Your invitation for <b>{}</b> to join <b>{}</b> was accepted. Please <a href=\"{}\">log in</a> to the bitwarden_rs server and confirm them from the organization management page.</p>
-             </html>", new_user_email, org_name, CONFIG.domain))
-    };
+pub fn send_invite_accepted(new_user_email: &str, address: &str, org_name: &str, config: &MailConfig) -> EmptyResult {
+    let (subject, body) = get_text(
+        "email_invite_accepted",
+        json!({
+            "url": CONFIG.domain,
+            "email": new_user_email,
+            "org_name": org_name,
+        }),
+    )?;
 
     send_email(&address, &subject, &body, &config)
 }
 
-pub fn send_invite_confirmed(
-    address: &str,
-    org_name: &str,
-    config: &MailConfig,
-) -> EmptyResult {
-    let (subject, body) = {
-        (format!("Invitation to {} confirmed", org_name),
-        format!(
-            "<html>
-             <p>Your invitation to join <b>{}</b> was confirmed. It will now appear under the Organizations the next time you <a href=\"{}\">log in</a> to the web vault.</p>
-             </html>", org_name, CONFIG.domain))
-    };
+pub fn send_invite_confirmed(address: &str, org_name: &str, config: &MailConfig) -> EmptyResult {
+    let (subject, body) = get_text(
+        "email_invite_confirmed",
+        json!({
+            "url": CONFIG.domain,
+            "org_name": org_name,
+        }),
+    )?;
 
     send_email(&address, &subject, &body, &config)
 }
 
 fn send_email(address: &str, subject: &str, body: &str, config: &MailConfig) -> EmptyResult {
     let email = EmailBuilder::new()
-    .to(address)
-    .from((config.smtp_from.clone(), "Bitwarden-rs"))
-    .subject(subject)
-    .header(("Content-Type", "text/html"))
-    .body(body)
-    .build()
-    .map_err(|e| Error::new("Error building email", e.to_string()))?;
+        .to(address)
+        .from((config.smtp_from.clone(), "Bitwarden-rs"))
+        .subject(subject)
+        .header(("Content-Type", "text/html"))
+        .body(body)
+        .build()
+        .map_err(|e| Error::new("Error building email", e.to_string()))?;
 
     mailer(config)
         .send(email.into())
         .map_err(|e| Error::new("Error sending email", e.to_string()))
         .and(Ok(()))
-}
\ No newline at end of file
+}
diff --git a/src/main.rs b/src/main.rs
index 6373fa7f..8c312d0a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,7 +21,9 @@ extern crate derive_more;
 #[macro_use]
 extern crate num_derive;
 
+use handlebars::Handlebars;
 use rocket::{fairing::AdHoc, Rocket};
+
 use std::{
     path::Path,
     process::{exit, Command},
@@ -323,6 +325,26 @@ pub struct Config {
     yubico_server: Option<String>,
 
     mail: Option<MailConfig>,
+    templates: Handlebars,
+}
+
+fn load_templates(path: Option<String>) -> Handlebars {
+    let mut hb = Handlebars::new();
+
+    // First register default templates here (use include_str?)
+    hb.register_template_string("tpl_1", "Good afternoon, {{name}}").unwrap();
+
+    // TODO: Development-only. Remove this before release
+    hb.register_templates_directory(".hbs", "src/static/templates").unwrap();
+    
+    // And then load user templates to overwrite the defaults
+    if let Some(path) = path {
+        // Use .hbs extension for the files
+        // Templates get registered with their relative name
+        hb.register_templates_directory(".hbs", path).unwrap();
+    }
+
+    hb
 }
 
 impl Config {
@@ -381,6 +403,7 @@ impl Config {
             yubico_server: get_env("YUBICO_SERVER"),
 
             mail: MailConfig::load(),
+            templates: load_templates(get_env("TEMPLATES_FOLDER")),
         }
     }
 }
diff --git a/src/static/templates/email_invite_accepted.hbs b/src/static/templates/email_invite_accepted.hbs
new file mode 100644
index 00000000..c88372c6
--- /dev/null
+++ b/src/static/templates/email_invite_accepted.hbs
@@ -0,0 +1,8 @@
+Invitation accepted
+<!---------------->
+<html>
+<p>
+    Your invitation for <b>{{email}}</b> to join <b>{{org_name}}</b> was accepted.
+    Please <a href="{{url}}">log in</a> to the bitwarden_rs server and confirm them from the organization management page.
+</p>
+</html>
diff --git a/src/static/templates/email_invite_confirmed.hbs b/src/static/templates/email_invite_confirmed.hbs
new file mode 100644
index 00000000..7fc7db78
--- /dev/null
+++ b/src/static/templates/email_invite_confirmed.hbs
@@ -0,0 +1,8 @@
+Invitation to {{org_name}} confirmed
+<!---------------->
+<html>
+<p>
+    Your invitation to join <b>{{org_name}}</b> was confirmed.
+    It will now appear under the Organizations the next time you <a href="{{url}}">log in</a> to the web vault.
+</p>
+</html>
\ No newline at end of file
diff --git a/src/static/templates/email_pw_hint_none.hbs b/src/static/templates/email_pw_hint_none.hbs
new file mode 100644
index 00000000..c73e3b3a
--- /dev/null
+++ b/src/static/templates/email_pw_hint_none.hbs
@@ -0,0 +1,3 @@
+Sorry, you have no password hint...
+<!---------------->
+Sorry, you have not specified any password hint...
diff --git a/src/static/templates/email_pw_hint_some.hbs b/src/static/templates/email_pw_hint_some.hbs
new file mode 100644
index 00000000..a2917a3d
--- /dev/null
+++ b/src/static/templates/email_pw_hint_some.hbs
@@ -0,0 +1,7 @@
+Your master password hint
+<!---------------->
+You (or someone) recently requested your master password hint.
+
+Your hint is: "{{hint}}"
+
+If you did not request your master password hint you can safely ignore this email.
diff --git a/src/static/templates/email_send_org_invite.hbs b/src/static/templates/email_send_org_invite.hbs
new file mode 100644
index 00000000..be4a443d
--- /dev/null
+++ b/src/static/templates/email_send_org_invite.hbs
@@ -0,0 +1,12 @@
+Join {{org_name}}
+<!---------------->
+<html>
+<p>
+You have been invited to join the <b>{{org_name}}</b> organization.
+<br>
+<br>
+<a href="{{url}}/#/accept-organization/?organizationId={{org_id}}&organizationUserId={{org_user_id}}&email={{email}}&organizationName={{org_name}}&token={{token}}">
+Click here to join</a>
+</p>
+<p>If you do not wish to join this organization, you can safely ignore this email.</p>
+</html>