550 Access denied - Invalid HELO name

Sep 21, 2015
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Dhaka
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Website Owner
Magento installed on Unbuntu has mail issue. sudo vi /var/mail/www-data displays the following error:

Code:
The original message was received at Mon, 7 Sep 2015 04:38:43 GMT from sub.mydomain.com [127.0.0.1]

----- The following addresses had permanent fatal errors ----- (reason: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1))

----- Transcript of session follows ----- ... while talking to mail.com.:

MAIL From: SIZE=567 AUTH=<> <<< 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) 554 5.0.0 Service unavailable

--t874ciGf030767.1441600724/localhost Content-Type: message/delivery-status

Reporting-MTA: dns; localhost Received-From-MTA: DNS; sub.mydomain.com Arrival-Date: Mon, 7 Sep 2015 04:38:43 GMT

Final-Recipient: RFC822; [email protected] Action: failed Status: 5.0.0 Diagnostic-Code: SMTP; 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) Last-Attempt-Date: Mon, 7 Sep 2015 04:38:44 GMT

--t874ciGf030767.1441600724/localhost Content-Type: text/rfc822-headers
Is it possible to isolate the issue from the above error details?
 
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