switch to postmark, add starttls conf option

conf/default.toml

@@ -3,6 +3,8 @@ listen = "[::]:3742"
 key = "Q^,zH6M}*JY-W[oWCn6T7W!G=TvN,a5[~%cfRKZ7jse1EMDgG7GdTFy)ez*E(9I"
 
 [email]
-server = "smtp.fastmail.com"
+server = "smtp.postmarkapp.com"
-username = "patrick@psbarrett.com"
+port = 587
-sender = "Z2A Bot <bot@azdle.net>"
+tls = "StartTls"
+username = "PM-T-outbound-Nh7Fw1vnQ3dwi-57cweG5e"
+sender = "Z2A Bot <bot@psbarrett.com>"

src/conf.rs

@@ -22,9 +22,16 @@ pub struct Email {
     pub username: String,
     pub password: String,
     pub sender: String,
+    pub tls: Option<TlsMode>,
     pub cert: Option<String>,
 }
 
+#[derive(Debug, Deserialize, Clone)]
+pub enum TlsMode {
+    Tls,
+    StartTls,
+}
+
 #[derive(Debug, Deserialize, Clone)]
 #[allow(unused)]
 pub struct Conf {

src/email_client/mod.rs

@@ -11,7 +11,7 @@ use lettre::{
 };
 use tokio::time::timeout;
 
-use crate::conf;
+use crate::conf::{self, TlsMode};
 
 #[derive(Clone)]
 pub enum EmailClient {
@@ -28,7 +28,12 @@ impl EmailClient {
             return Ok(EmailClient::Disabled);
         };
 
-        let mut inner = AsyncSmtpTransport::<Tokio1Executor>::relay(&conf.server).unwrap();
+        let mut inner = match conf.tls {
+            Some(TlsMode::Tls) | None => AsyncSmtpTransport::<Tokio1Executor>::relay(&conf.server)?,
+            Some(TlsMode::StartTls) => {
+                AsyncSmtpTransport::<Tokio1Executor>::starttls_relay(&conf.server)?
+            }
+        };
 
         if let Some(port) = conf.port {
             inner = inner.port(port);

tests/fixture/mod.rs

@@ -59,6 +59,7 @@ impl TestServer {
                 username: "bot@example.com".to_owned(),
                 password: "1234".to_owned(),
                 sender: "bot@example.com".to_owned(),
+                tls: None,
                 cert: Some(String::from_utf8_lossy(mock_smtp_server.cert_pem()).to_string()),
             }),
         })