How to resolve “550 Access denied – Invalid HELO name” error from Outlook (0x800ccc78), Windows Mail, etc in DirectAdmin Exim mail servers
The mail user reports the error:
Task user@domain.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 4.1.1.1)
Corresponding entry in Exim logs say:
2014-09-24 07:06:31 H=isp-ip-dom.net [xxx.xxx.xxx.xxx] rejected MAIL <user@domain.com>: Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
At Bobcares help desk support services, this is a common error we see in DirectAdmin shared hosting servers. Strict anti-spam rules or lack of SMTP authentication usually cause this error.
Hire Bobcares Linux Server Administrators
Get super reliable servers and delighted customers
Given below are a few scenarios we’ve encountered, and the solutions we provided for them. (more…)
