Updated dependencies and small mail fixes

- Updated rust nightly
- Updated depenencies
- Removed unicode support for regex (less dependencies)
- Fixed dependency and nightly changes/deprications
- Some mail changes for less spam point triggering

src/mail.rs

@@ -302,30 +302,32 @@ fn send_email(address: &str, subject: &str, body_html: &str, body_text: &str) ->
 
     let address = format!("{}@{}", address_split[1], domain_puny);
 
-    let html = SinglePart::base64()
+    let html = SinglePart::builder()
+        // We force Base64 encoding because in the past we had issues with different encodings.
+        .header(header::ContentTransferEncoding::Base64)
         .header(header::ContentType("text/html; charset=utf-8".parse()?))
-        .body(body_html);
+        .body(String::from(body_html));
 
-    let text = SinglePart::base64()
+    let text = SinglePart::builder()
+        // We force Base64 encoding because in the past we had issues with different encodings.
+        .header(header::ContentTransferEncoding::Base64)
         .header(header::ContentType("text/plain; charset=utf-8".parse()?))
-        .body(body_text);
+        .body(String::from(body_text));
 
-    // The boundary generated by Lettre it self is mostly too large based on the RFC822, so we generate one our selfs.
-    use uuid::Uuid;
-    let unique_id = Uuid::new_v4().to_simple();
-    let boundary = format!("_Part_{}_", unique_id);
-    let alternative = MultiPart::alternative().boundary(boundary).singlepart(text).singlepart(html);
     let smtp_from = &CONFIG.smtp_from();
-
     let email = Message::builder()
-        .message_id(Some(format!("<{}.{}>", unique_id, smtp_from)))
+        .message_id(Some(format!("<{}@{}>", crate::util::get_uuid(), smtp_from.split('@').collect::<Vec<&str>>()[1] )))
         .to(Mailbox::new(None, Address::from_str(&address)?))
         .from(Mailbox::new(
             Some(CONFIG.smtp_from_name()),
             Address::from_str(smtp_from)?,
         ))
         .subject(subject)
-        .multipart(alternative)?;
+        .multipart(
+            MultiPart::alternative()
+                .singlepart(text)
+                .singlepart(html)
+        )?;
 
     match mailer().send(&email) {
         Ok(_) => Ok(()),