mail: set message id with own host in outgoing mail

Cargo.lock

@@ -631,6 +631,7 @@ dependencies = [
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "vergen 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 

Cargo.toml

@@ -30,6 +30,7 @@ handlebars = "1.1.0"
 num_cpus = "1.0"
 ring = "0.13"
 base64 = "0.10"
+uuid = "0.7"
 
 [dependencies.lettre]
 version = "0.9"

src/mail.rs

@@ -6,6 +6,7 @@ use lettre::{Transport as LettreTransport, SendmailTransport, file::FileTranspor
 use lettre_email::{Mailbox,EmailBuilder};
 use url;
 use serde::Serialize;
+use uuid::Uuid;
 
 use database::types::Email;
 use Result;
@@ -136,7 +137,8 @@ impl Service {
             .alternative(
                 html.ok_or(failure::err_msg("Email template failed to render"))?,
                 txt.ok_or(failure::err_msg("Email template failed to render"))?,
-            );
+            )
+            .message_id(format!("<{}@{}>", Uuid::new_v4(), self.domain));
 
         let email = to.iter().fold(email, |email, to| email.to(to.to_string()));
 

src/main.rs

@@ -23,6 +23,7 @@ extern crate handlebars;
 extern crate lettre;
 extern crate lettre_email;
 extern crate tempfile;
+extern crate uuid;
 
 #[cfg(test)]
 extern crate regex;