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Email Marketing Forum The email marketing forum is for discussing topics related to email marketing and online services / offline software that allows you to carry out email marketing campaigns. This can include autoresponders and broadcast emailing systems.

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Unread 06-18-2012, 07:21 PM   #1
probuddha
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Default 451 4.5.0 SMTP protocol violation, see RFC 2821

So one of our servers has stopped delivering emails completely. I checked with the RBLs and the IP is clean

I contacted the hosting support and they said that our server gives the following error

451 4.5.0 SMTP protocol violation, see RFC 2821

And insisted that we reinstall the server.

But before I go in for the re-installation, can someone throw some light on what this violation means and what are the protocols I need to follow. Is there a way I can resolve this without re-installation?

Also, this email server was working fine before, so can this violation occur all of a sudden just like that?

Please advise
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Unread 06-18-2012, 09:01 PM   #2
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Check out this link that I found that might be helpful
Kevin Kanarski: Google - 451 4.5.0 SMTP protocol violation

Velocity Software - Email and Social Media Marketing the ultimate marketing platform.
http://www.velocitymarketingsoftware.com
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Unread 06-18-2012, 10:16 PM   #3
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Thanks again!

I did a EHLO on my domain name but it returned

EHLO: command not found

What am I doing wrong here?
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Unread 06-18-2012, 11:39 PM   #4
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Try just doing the helo
Command instead not all mailservers support ehlo

Velocity Software - Email and Social Media Marketing the ultimate marketing platform.
http://www.velocitymarketingsoftware.com
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