Phishing Alert: Undeliverable E-Mail – SMTP error from remote mail server host

Report Phishing Email to ITSC
Guide to Handle Phishing Email

Here is how the phishing email looks.


Sender: xxxx.edu.hk SMTP Mail Error <admin@axcelx.com>, xxxx.edu.hk SMTP Mail Error <noc@axcelx.com>
Sent:
Mon 05-09-22 2:48 PM
Subject: Undeliverable E-Mail – SMTP error from remote mail server host

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:

 
    host mail.axcelx.com[192.34.81.55]
    SMTP error from remote mail server after 
    550 5.1.1 <> recipient domain rejected – invalid DNS
Reporting-MTA: dns; box2241.axcelx.com

Action: failed
Final-Recipient: rfc822;
Status: 5.0.0
Remote-MTA: dns; .mail.axcelx.com
Diagnostic-Code: smtp; 550 5.1.1 <> recipient domain rejected – invalid DNS