Revert "fix: apply workaround for clients that send mail from auth=<>…

…, but only when not using authentication"

This reverts commit 76e6162.

src/mailrise/smtp.py

@@ -103,17 +103,6 @@ async def handle_DATA(self, server: SMTP, session: Session, envelope: Envelope)
 
         return '250 OK'
 
-    # pylint: disable=invalid-name,unused-argument
-    async def handle_EHLO(self, _server: SMTP, session: Session, _envelope: Envelope,
-                          hostname: str, responses: list[str]) -> list[str]:
-        """This hook is called during ``EHLO``."""
-        if not self.config.authenticator:
-            # Workaround for SMTP clients that send MAIL FROM AUTH=<>
-            # It only works if we're not using SMTP authentication.
-            # https://github.com/aio-libs/aiosmtpd/issues/299#issuecomment-1427487291
-            session.host_name = hostname  # type: ignore
-            return [r for r in responses if not r.startswith("250-AUTH")]
-
 
 def _parsemessage(msg: StdlibEmailMessage, envelope: Envelope) -> r.EmailMessage:
     """Parses an email message into an `EmailNotification`.