Subject: Mail delivery failed: returning message to sender
From: Mail Delivery System <[email-masked]>
To: [email-masked]
Date: Sun, 14 May 2023 16:56:39 +0300

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email-masked]
    (ultimately generated from [email-masked])
    host gmail-smtp-in.l.google.com [64.233.162.26]
    SMTP error from remote mail server after end of data:
    552-5.7.0 This message was blocked because its content presents a potential
    552-5.7.0 security issue. Please visit
    552-5.7.0  https://support.google.com/mail/?p=BlockedMessage to review our
    552 5.7.0 message content and attachment content guidelines. q12-20020a2e84cc000000b002adbb538b86si3578028ljh.334 - gsmtp