Use email.utils.formatdate() for dates in headers

classes/smtpdhandler.py

@@ -1,7 +1,7 @@
 import uuid
 import json
 
-from datetime import datetime
+from email.utils import formatdate
 from pathlib import Path
 
 
@@ -21,9 +21,9 @@ class SmtpdHandler:
         try:
             with open(Path(self.config.maildir) / f"{eid}.eml", "wb") as mailfile:
                 mailfile.write(
-                    f"From {envelope.mail_from} {datetime.now().isoformat()}\n".encode())
+                    f"From {envelope.mail_from} {formatdate()}\n".encode())
                 mailfile.write(
-                    f"Received: from {session.host_name} ({session.peer[0]}) by {server.hostname} (Kumi Systems FileMailer) id {eid}; {datetime.now().isoformat()}\n".encode())
+                    f"Received: from {session.host_name} ({session.peer[0]}) by {server.hostname} (Kumi Systems FileMailer) id {eid}; {formatdate()}\n".encode())
                 mailfile.write(envelope.original_content)
             with open(Path(self.config.maildir) / f"{eid}.json", "w") as jsonfile:
                 data = {