Undelivered Mail Returned to Sender

From: Mail Delivery System <MAILER-DAEMON_at_vtmail3.virustotal.com>
Date: Sun, 23 May 2021 04:03:02 +0200 (CEST)
This is the mail system at host vtmail3.virustotal.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<vmalvarez_at_lab.virustotal.com> (expanded from <vmalvarez_at_virustotal.com>): host
    aspmx.l.google.com[66.102.1.27] said: 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.
    h13si6033939wrc.121 - gsmtp (in reply to end of DATA command)

Received on Sun May 23 2021 - 02:03:02 UTC

Original text of this message