Select Page

virtualmin webmin email


What causes “Sender verify failed” SMTP mail error, and how to resolve it in Webmin/Virtualmin Postfix servers

SMTP error from remote mail server after RCPT TO:<user2@domain2.com>:
host mx.server.com [xxx.xxx.xxx.xxx]: 550-Verification failed for <user1@domain1.com>
550-The mail server could not deliver mail to user1@domain1.com. The account ordomain may not exist, they may be blacklisted, or missing the proper dns entries.
550 Sender verify failed

If you are a Webmin/Virtualmin web host, you would recognize this as one of the common errors reported by your customers.

Hire Bobcares Linux Server Administrators
Get super reliable servers and delighted customers

See how we do it!

 

Sender verify failed can be caused by issues ranging from improper file permissions to RFC non-compliance. Engineers at Bobcares help desk support services collect detailed information regarding the error through log analysis and engaging the customer. The following are the few of the common causes for this error. (more…)

How to resolve “550 Access denied Virtualmin/Webmin Postfix 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 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 4.1.1.1)

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.

 

Hire Bobcares Linux Server Administrators
Get super reliable servers and delighted customers

See how we do it!

 

 

Given below are a few scenarios we’ve encountered, and the solutions we provided for them. (more…)