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550 access denied – invalid helo name plesk

Fix “550 Access denied in Parallels Plesk Postfix mail servers

The mail user reports the error:

Task – 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

Corresponding entry in Postfix logs say:

2014-09-12 12:19:45 [] rejected MAIL : 
Access denied - Invalid HELO name (See RFC2821

At Bobcares help desk support services, this is a common error we see in Parallels Plesk shared hosting servers. Strict anti-spam rules or lack of SMTP authentication usually cause this error. Given below are a few scenarios we’ve encountered, and the solutions we provided for them. (more…)