Add email notifications to comments

5 files changed, 406 insertions, 11 deletions

diff --git a/comments/.gitignore b/comments/.gitignore
index ea8c4bf..fedaa2b 100644
--- a/comments/.gitignore
+++ b/comments/.gitignore
@@ -1 +1,2 @@
 /target
+.env
diff --git a/comments/Cargo.lock b/comments/Cargo.lock
index 1f2ab0b..e17d914 100644
--- a/comments/Cargo.lock
+++ b/comments/Cargo.lock
@@ -200,6 +200,7 @@ version = "0.1.0"
 dependencies = [
  "askama",
  "axum",
+ "lettre",
  "serde",
  "sqlx",
  "tokio",
@@ -212,6 +213,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fbdcdcb6d86f71c5e97409ad45898af11cbc995b4ee8112d59095a28d376c935"
 
 [[package]]
+name = "core-foundation"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "194a7a9e6de53fa55116934067c844d9d749312f75c6f6d0980e8c252f8c2146"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5827cebf4670468b8772dd191856768aedcb1b0278a04f989f7766351917b9dc"
+
+[[package]]
 name = "cpufeatures"
 version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -314,18 +331,58 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
 
 [[package]]
+name = "email-encoding"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34dd14c63662e0206599796cd5e1ad0268ab2b9d19b868d6050d688eba2bbf98"
+dependencies = [
+ "base64",
+ "memchr",
+]
+
+[[package]]
+name = "email_address"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2153bd83ebc09db15bcbdc3e2194d901804952e3dc96967e1cd3b0c5c32d112"
+
+[[package]]
 name = "event-listener"
 version = "2.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0206175f82b8d6bf6652ff7d71a1e27fd2e4efde587fd368662814d6ec1d9ce0"
 
 [[package]]
+name = "fastrand"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7a407cfaa3385c4ae6b23e84623d48c2798d06e3e6a1878f7f59f17b3f86499"
+dependencies = [
+ "instant",
+]
+
+[[package]]
 name = "fnv"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
+name = "foreign-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
+dependencies = [
+ "foreign-types-shared",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
+
+[[package]]
 name = "form_urlencoded"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -362,6 +419,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "futures-io"
+version = "0.3.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00f5fb52a06bdcadeb54e8d3671f8888a39697dcb0b81b23b55174030427f4eb"
+
+[[package]]
 name = "futures-sink"
 version = "0.3.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -380,10 +443,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "197676987abd2f9cadff84926f410af1c183608d36641465df73ae8211dc65d6"
 dependencies = [
  "futures-core",
+ "futures-io",
  "futures-sink",
  "futures-task",
+ "memchr",
  "pin-project-lite",
  "pin-utils",
+ "slab",
 ]
 
 [[package]]
@@ -474,6 +540,17 @@ dependencies = [
 ]
 
 [[package]]
+name = "hostname"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c731c3e10504cc8ed35cfe2f1db4c9274c3d35fa486e3b31df46f068ef3e867"
+dependencies = [
+ "libc",
+ "match_cfg",
+ "winapi",
+]
+
+[[package]]
 name = "http"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -544,6 +621,17 @@ dependencies = [
 
 [[package]]
 name = "idna"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418a0a6fab821475f634efe3ccc45c013f742efe03d853e8d3355d5cb850ecf8"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
+[[package]]
+name = "idna"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
@@ -596,6 +684,38 @@ dependencies = [
 ]
 
 [[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "lettre"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eabca5e0b4d0e98e7f2243fb5b7520b6af2b65d8f87bcc86f2c75185a6ff243"
+dependencies = [
+ "async-trait",
+ "base64",
+ "email-encoding",
+ "email_address",
+ "fastrand",
+ "futures-io",
+ "futures-util",
+ "hostname",
+ "httpdate",
+ "idna 0.2.3",
+ "mime",
+ "native-tls",
+ "nom",
+ "once_cell",
+ "quoted_printable",
+ "socket2",
+ "tokio",
+ "tokio-native-tls",
+]
+
+[[package]]
 name = "libc"
 version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -621,6 +741,18 @@ dependencies = [
 ]
 
 [[package]]
+name = "match_cfg"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffbee8634e0d45d258acb448e7eaab3fce7a0a467395d4d9f228e3c1f01fb2e4"
+
+[[package]]
+name = "matches"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
+
+[[package]]
 name = "matchit"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -672,7 +804,25 @@ dependencies = [
  "libc",
  "log",
  "wasi",
- "windows-sys",
+ "windows-sys 0.42.0",
+]
+
+[[package]]
+name = "native-tls"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07226173c32f2926027b63cce4bcd8076c3552846cbe7925f3aaffeac0a3b92e"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "log",
+ "openssl",
+ "openssl-probe",
+ "openssl-sys",
+ "schannel",
+ "security-framework",
+ "security-framework-sys",
+ "tempfile",
 ]
 
 [[package]]
@@ -711,6 +861,51 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "86f0b0d4bf799edbc74508c1e8bf170ff5f41238e5f8225603ca7caaae2b7860"
 
 [[package]]
+name = "openssl"
+version = "0.10.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b102428fd03bc5edf97f62620f7298614c45cedf287c271e7ed450bbaf83f2e1"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "foreign-types",
+ "libc",
+ "once_cell",
+ "openssl-macros",
+ "openssl-sys",
+]
+
+[[package]]
+name = "openssl-macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b501e44f11665960c7e7fcf062c7d96a14ade4aa98116c004b2e37b5be7d736c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "openssl-probe"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
+
+[[package]]
+name = "openssl-sys"
+version = "0.9.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23bbbf7854cd45b83958ebe919f0e8e516793727652e27fda10a8384cfc790b7"
+dependencies = [
+ "autocfg",
+ "cc",
+ "libc",
+ "pkg-config",
+ "vcpkg",
+]
+
+[[package]]
 name = "parking_lot"
 version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -755,7 +950,7 @@ dependencies = [
  "libc",
  "redox_syscall",
  "smallvec",
- "windows-sys",
+ "windows-sys 0.42.0",
 ]
 
 [[package]]
@@ -803,6 +998,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
+name = "pkg-config"
+version = "0.3.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ac9a59f73473f1b8d852421e59e64809f025994837ef743615c6d0c5b305160"
+
+[[package]]
 name = "ppv-lite86"
 version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -833,6 +1034,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "quoted_printable"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20f14e071918cbeefc5edc986a7aa92c425dae244e003a35e1cdddb5ca39b5cb"
+
+[[package]]
 name = "rand"
 version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -883,6 +1090,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "remove_dir_all"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
 name = "ring"
 version = "0.16.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -932,6 +1148,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7b4b9743ed687d4b4bcedf9ff5eaa7398495ae14e61cba0a295704edbc7decde"
 
 [[package]]
+name = "schannel"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88d6731146462ea25d9244b2ed5fd1d716d25c52e4d54aa4fb0f3c4e9854dbe2"
+dependencies = [
+ "lazy_static",
+ "windows-sys 0.36.1",
+]
+
+[[package]]
 name = "scopeguard"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -948,6 +1174,29 @@ dependencies = [
 ]
 
 [[package]]
+name = "security-framework"
+version = "2.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bc1bb97804af6631813c55739f771071e0f2ed33ee20b68c86ec505d906356c"
+dependencies = [
+ "bitflags",
+ "core-foundation",
+ "core-foundation-sys",
+ "libc",
+ "security-framework-sys",
+]
+
+[[package]]
+name = "security-framework-sys"
+version = "2.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0160a13a177a45bfb43ce71c01580998474f556ad854dcbca936dd2841a5c556"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
 name = "semver"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1061,6 +1310,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "slab"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4614a76b2a8be0058caa9dbbaf66d988527d86d003c11a94fbd335d7661edcef"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
 name = "smallvec"
 version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1279,6 +1537,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "20518fe4a4c9acf048008599e464deb21beeae3d3578418951a189c235a7a9a8"
 
 [[package]]
+name = "tempfile"
+version = "3.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cdb1ef4eaeeaddc8fbd371e5017057064af0911902ef36b39801f67cc6d79e4"
+dependencies = [
+ "cfg-if",
+ "fastrand",
+ "libc",
+ "redox_syscall",
+ "remove_dir_all",
+ "winapi",
+]
+
+[[package]]
 name = "thiserror"
 version = "1.0.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1368,7 +1640,7 @@ dependencies = [
  "signal-hook-registry",
  "socket2",
  "tokio-macros",
- "windows-sys",
+ "windows-sys 0.42.0",
 ]
 
 [[package]]
@@ -1383,6 +1655,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "tokio-native-tls"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7d995660bd2b7f8c1568414c1126076c13fbb725c40112dc0120b78eb9b717b"
+dependencies = [
+ "native-tls",
+ "tokio",
+]
+
+[[package]]
 name = "tokio-rustls"
 version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1548,7 +1830,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
 dependencies = [
  "form_urlencoded",
- "idna",
+ "idna 0.3.0",
  "percent-encoding",
 ]
 
@@ -1559,6 +1841,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
 
 [[package]]
+name = "vcpkg"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
+
+[[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1698,17 +1986,30 @@ checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
 [[package]]
 name = "windows-sys"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
+dependencies = [
+ "windows_aarch64_msvc 0.36.1",
+ "windows_i686_gnu 0.36.1",
+ "windows_i686_msvc 0.36.1",
+ "windows_x86_64_gnu 0.36.1",
+ "windows_x86_64_msvc 0.36.1",
+]
+
+[[package]]
+name = "windows-sys"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
 dependencies = [
  "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
+ "windows_aarch64_msvc 0.42.0",
+ "windows_i686_gnu 0.42.0",
+ "windows_i686_msvc 0.42.0",
+ "windows_x86_64_gnu 0.42.0",
  "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_x86_64_msvc 0.42.0",
 ]
 
 [[package]]
@@ -1719,24 +2020,48 @@ checksum = "41d2aa71f6f0cbe00ae5167d90ef3cfe66527d6f613ca78ac8024c3ccab9a19e"
 
 [[package]]
 name = "windows_aarch64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
+
+[[package]]
+name = "windows_aarch64_msvc"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd0f252f5a35cac83d6311b2e795981f5ee6e67eb1f9a7f64eb4500fbc4dcdb4"
 
 [[package]]
 name = "windows_i686_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
+
+[[package]]
+name = "windows_i686_gnu"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fbeae19f6716841636c28d695375df17562ca208b2b7d0dc47635a50ae6c5de7"
 
 [[package]]
 name = "windows_i686_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
+
+[[package]]
+name = "windows_i686_msvc"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "84c12f65daa39dd2babe6e442988fc329d6243fdce47d7d2d155b8d874862246"
 
 [[package]]
 name = "windows_x86_64_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
+
+[[package]]
+name = "windows_x86_64_gnu"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf7b1b21b5362cbc318f686150e5bcea75ecedc74dd157d874d754a2ca44b0ed"
@@ -1749,6 +2074,12 @@ checksum = "09d525d2ba30eeb3297665bd434a54297e4170c7f1a44cad4ef58095b4cd2028"
 
 [[package]]
 name = "windows_x86_64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
+
+[[package]]
+name = "windows_x86_64_msvc"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f40009d85759725a34da6d89a94e63d7bdc50a862acf0dbc7c8e488f1edcb6f5"
diff --git a/comments/Cargo.toml b/comments/Cargo.toml
index 8773580..22bd5c3 100644
--- a/comments/Cargo.toml
+++ b/comments/Cargo.toml
@@ -11,4 +11,4 @@ axum = { version="0.6" }
 serde = "1"
 sqlx = { version = "0.5", features = ["runtime-tokio-rustls", "any", "postgres", "time", "uuid"] }
 tokio = { version = "1", features = ["full"] }
-
+lettre = { version = "0.10", features = ["tokio1-native-tls"] }
diff --git a/comments/src/main.rs b/comments/src/main.rs
index 2bc11fa..7064bca 100644
--- a/comments/src/main.rs
+++ b/comments/src/main.rs
@@ -15,6 +15,10 @@ use axum::{
     routing::get,
     Router,
 };
+use lettre::{
+    AsyncSmtpTransport, AsyncTransport, Message, Tokio1Executor,
+    transport::smtp::authentication::Credentials
+};
 use serde::Deserialize;
 use sqlx::{
     postgres::{PgPool, PgPoolOptions},
@@ -25,11 +29,20 @@ use sqlx::{
 };
 use std::{net::SocketAddr, time::Duration};
 
+
 // Useful global thingies
 #[derive(Clone)]
 struct Ctx {
     pool: PgPool,
     base_path: String,
+    mail_opts: Option<MailCtx>,
+}
+
+#[derive(Clone)]
+struct MailCtx {
+    notification_address: String,
+    smtp_server: String,
+    smtp_credentials: Credentials,
 }
 
 #[tokio::main]
@@ -40,6 +53,18 @@ async fn main() {
     let db_connection_str = std::env::var("DATABASE_URL")
         .unwrap_or_else(|_| "postgres://postgres:password@localhost".to_string());
 
+    let notification_address = std::env::var("NOTIFICATION_ADDRESS").ok();
+    let mail_opts = notification_address.map(|na| {
+        let smtp_server = std::env::var("SMTP_SERVER").expect("SMTP_SERVER  not supplied!");
+        let smtp_username = std::env::var("SMTP_USERNAME").expect("SMTP_USERNAME not supplied!");
+        let smtp_password = std::env::var("SMTP_PASSWORD").expect("SMTP_PASSWORD not supplied!");
+        MailCtx{
+            smtp_server: smtp_server,
+            smtp_credentials: Credentials::new(smtp_username, smtp_password),
+            notification_address: na,
+        }
+    });
+
     let pool = PgPoolOptions::new()
         .max_connections(5)
         .connect_timeout(Duration::from_secs(3))
@@ -51,7 +76,7 @@ async fn main() {
         .await
         .expect("failed to run migrations");
     
-    let ctx = Ctx {pool, base_path: base_path.clone()};
+    let ctx = Ctx {pool, base_path: base_path.clone(), mail_opts};
 
     let app = Router::new()
         .nest(&base_path, Router::new()
@@ -142,6 +167,14 @@ struct CapchaAnswer {
     answer:String
 }
 
+#[derive(Template)]
+#[template(path = "notification.txt")]
+struct Notification<'a> {
+    url: &'a str,
+    comment: &'a str,
+    author: &'a str,
+}
+
 async fn post_comments(
     State(ctx): State<Ctx>,
     Form(post_comment): Form<PostComment>) -> Result<Redirect,(StatusCode,String)> {
@@ -158,6 +191,31 @@ async fn post_comments(
         .execute(&ctx.pool)
         .await
         .map_err(internal_error)?;
+
+    if let Some(mail_opts) = ctx.mail_opts {
+        let mail_body = Notification{
+            url: &post_comment.url,
+            author: &post_comment.author,
+            comment: &post_comment.comment
+        }.render().unwrap();
+        let email = Message::builder()
+            // TODO should be a config value
+            .from("Comments Service <comments@mfashby.net>".parse().unwrap())
+            .to(mail_opts.notification_address.parse().unwrap())
+            .subject(format!("New comment on {}", post_comment.url))
+            .body(mail_body)
+            .unwrap();
+        let mailer: AsyncSmtpTransport<Tokio1Executor> =
+            AsyncSmtpTransport::<Tokio1Executor>::relay(&mail_opts.smtp_server)
+                .unwrap()
+                .credentials(mail_opts.smtp_credentials)
+                .build();
+        match mailer.send(email).await {
+            Ok(_) => (),
+            Err(e) => eprintln!("Could not send email: {:?}", e),
+        }
+    };
+    
     Ok(Redirect::temporary(&post_comment.url))
 }
 
diff --git a/comments/templates/notification.txt b/comments/templates/notification.txt
new file mode 100644
index 0000000..ba85056
--- /dev/null
+++ b/comments/templates/notification.txt
@@ -0,0 +1,5 @@
+New comment on {{ url }}:
+
+Author: {{ author }} 
+
+Comment: {{ comment }}
\ No newline at end of file