The mail user reports the error:
Task email@example.com – Sending reported error (0x800CCC78): ‘Cannot send the message. Verify the email address in your account properties. The server responded: 550 Access denied – Invalid HELO name (See RFC2821 220.127.116.11)
Corresponding entry in Postfix logs say:
2014-09-12 12:19:45 H=isp-ip-rev-dns.net [xxx.xxx.xxx.xxx] rejected MAIL : Access denied - Invalid HELO name (See RFC2821 18.104.22.168)
At Bobcares help desk support services, this is a common error we see in Virtualmin/Webmin shared hosting servers. Strict anti-spam rules or lack of SMTP authentication usually cause this error.
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Given below are a few scenarios we’ve encountered, and the solutions we provided for them. (more…)