Undelivered Mail Returned to Sender

[http://www.sneak2.sneakemail.com/~MAILER-DAEMON (Mail Delivery System)]

This is the mail system at host sneak2.sneakemail.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

<http://www.mysmsforward.com/~F1my-Oakland-voicemail-number-T99875>: host
    use2.mysmsforward.com[18.224.233.2] said: 554 Bad Source or Dest Address
    (in reply to end of DATA command)

Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; sneak2.sneakemail.com
X-Postfix-Queue-ID: 839FB806B1
X-Postfix-Sender: rfc822; http://dummy.us.eu.org/robert
Arrival-Date: Fri, 14 Feb 2025 22:53:00 +0000 (UTC)

Final-Recipient: rfc822; http://www.mysmsforward.com/~F1my-Oakland-voicemail-number-T99875
Original-Recipient: rfc822;http://www.mysmsforward.com/~F1my-Oakland-voicemail-number-T99875
Action: failed
Status: 5.0.0
Remote-MTA: dns; use2.mysmsforward.com
Diagnostic-Code: smtp; 554 Bad Source or Dest Address

Content-Description: Undelivered Message
Content-Type: message/rfc822
Content-Transfer-Encoding: 8bit

 > Date: 14 Feb 2025 14:52:54 -0800
 > From: "robert b" <http://dummy.us.eu.org/robert>
 > To: http://www.mysmsforward.com/~F1my-Oakland-voicemail-number-T99875
 > 
 > Please stop.