QMail - Error 533

[ChildOTK]

Good Day,

I recently upgraded from 8.6.0 to 9.5.2 and have found now that residents on our campus are no longer able to send email via our server and receive error 533.

"533 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"

On 8.6.0 they would simply be authenticated via IP address. On 9.5.2 it appears this is not working. I have removed the campus IP address and reinserted it. This appeared to work, for a few hours, and then went right back to the same problem.

I upgraded the add-ons from 4PSA, Spam Guardian and Clean Server, to work with 9.5.2, and this worked for a while too but now again I am having the same issue.

Any help with this will be appreciated.

Thank you.

 

[IgorG]

Look at these KB articles:

http://kb.odin.com/en/168
http://kb.odin.com/en/5972

Maybe it will help.

 

[ChildOTK]

Thanks for the links.

I understand that my issue is "authentication" as per the first link, and I have our campus IP addresses in the whitelist as per link 2. This is exactly how it was setup with Plesk 8.6.0 when everything was working great. Upgrading to 9.5.2 then messed this up and it appears the authentication is no longer working. So I do not know what to do.

I have removed and added again our IP addresses, found it to work for a little bit of time and then land up right back at the 533 error.