Use async lettre

Cargo.toml

@@ -18,7 +18,7 @@ diesel = { version = "2.0", features = ["r2d2", "sqlite", "returning_clauses_for
 diesel_migrations = { version = "2.0.0", features = ["sqlite"] }
 hex = "0.4"
 hmac = "0.12"
-lettre = { version = "0.10", default-features = false, features = ["smtp-transport", "hostname", "rustls-tls", "pool", "builder"] }
+lettre = { version = "0.10", default-features = false, features = ["smtp-transport", "hostname", "tokio1-rustls-tls", "pool", "builder"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 serde_yaml = "0.9"

src/mailer.rs

@@ -2,15 +2,20 @@ use anyhow::{Context, Result};
 use lettre::{
     address::Address,
     message::{Mailbox, Message, MessageBuilder},
-    transport::{smtp::authentication::Credentials, Transport},
-    SmtpTransport,
+    transport::{
+        smtp::{authentication::Credentials, AsyncSmtpTransport},
+        AsyncTransport,
+    },
+    Tokio1Executor,
 };
 use std::mem;
 
 use crate::config;
 
+type ASmtpTransport = AsyncSmtpTransport<Tokio1Executor>;
+
 pub struct Mailer {
-    mailer: SmtpTransport,
+    mailer: ASmtpTransport,
     message_builder: MessageBuilder,
 }
 
@@ -21,7 +26,7 @@ impl Mailer {
             mem::take(&mut config.email_server.password),
         );
 
-        let mailer = SmtpTransport::relay(&config.email_server.server_name)
+        let mailer = ASmtpTransport::relay(&config.email_server.server_name)
             .context("Failed to connect to the email server!")?
             .credentials(creds)
             .build();
@@ -52,7 +57,10 @@ impl Mailer {
             .body(hook_log_link.to_string())
             .context("Failed to build email!")?;
 
-        self.mailer.send(&email).context("Failed to send email!")?;
+        self.mailer
+            .send(email)
+            .await
+            .context("Failed to send email!")?;
 
         Ok(())
     }