Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Thu, 9 Oct 2025 13:16:23 GMT

The original message was received at Thu, 9 Oct 2025 13:16:23 GMT
from m0272703.ppops.net [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550-5.1.1 The email account that you tried to reach does not exist. Please try)

   ----- Transcript of session follows -----
... while talking to aspmx.l.google.com.:
>>> DATA
<<< 550-5.1.1 The email account that you tried to reach does not exist. Please try
<<< 550-5.1.1 double-checking the recipient's email address for typos or
<<< 550-5.1.1 unnecessary spaces. For more information, go to
<<< 550 5.1.1  https://support.google.com/mail/?p=NoSuchUser 71dfb90a1353d-5523d0aeab1si2090593e0c.237 - gsmtp
550 5.1.1 <[email-masked]>... User unknown
<<< 503-5.5.1 RCPT first. A mail transaction protocol command was issued out of
<<< 503-5.5.1 sequence. For more information, go to
<<< 503-5.5.1  https://support.google.com/a/answer/3221692 and review RFC 5321
<<< 503 5.5.1 specifications. 71dfb90a1353d-5523d0aeab1si2090593e0c.237 - gsmtp