Add support for insecure certs for SMTPS

src/config.rs

@@ -345,6 +345,8 @@ make_config! {
         smtp_username:          String, true,   option;
         /// Password
         smtp_password:          Pass,   true,   option;
+        /// Accept invalid certificates
+        smtp_ssl_insecure:      bool,   true,   def,    false;
     },
 }
 

src/mail.rs

@@ -18,6 +18,7 @@ fn mailer() -> SmtpTransport {
     let client_security = if CONFIG.smtp_ssl() {
         let tls = TlsConnector::builder()
             .min_protocol_version(Some(Protocol::Tlsv11))
+            .danger_accept_invalid_certs(CONFIG.smtp_ssl_insecure())
             .build()
             .unwrap();