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Attempting to configure some software on our server to send email via SMTP.

When testing it, get this SMTP Error: SMTP Error: The following recipients failed [address]"

Based on my research and a reply from the software's support team this error usually occurs because relaying is not allowed on the SMTP server from the IP address of the web server. The solution is to "Go to the configuration of your SMTP server and turn relaying on for your IP address"

My question is -- how do I do this? Is this done from WHM? cPanel?


migration rejected from Apr 18 '15 at 18:13

This question came from our site for professional and enthusiast programmers. Votes, comments, and answers are locked due to the question being closed here, but it may be eligible for editing and reopening on the site where it originated.

closed as off-topic by masegaloeh, kasperd, Scott Pack, Jenny D, Katherine Villyard Apr 18 '15 at 18:13

  • This question does not appear to be about server, networking, or related infrastructure administration within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

What OS is your SMTP server on? – JP Alioto Jul 22 '09 at 5:42
And what SMTP server are you running? – theatrus Jul 22 '09 at 5:44
Since you mentioned cPanel I assume this is a SMTP server running on a hosting provider. If so, which one? – devstuff Jul 22 '09 at 5:51
Yup -- it is cPanel / WHM. Not sure what SMTP server i'm running. How can I find this out? Thanks for the tip on Put this question there and am glad to have that in my bookmarks now. – Susan Jul 23 '09 at 6:50
Questions involving web hosting control panels are off-topic at Server Fault because they customize their systems beyond the ability to be supported in normal ways, and thus require support from the vendor or the web hosting industry. See Where can I ask questions about web hosting control panels? – masegaloeh Apr 18 '15 at 10:50

SInce you appear to be using a hosting service provider, the best solution is probably to raise a support call with them as they will know what the software is, what their default config looks like and presumably how to change it.

All we can do is ask you lots of questions, which if you don't know what your SMTP software is, you're mot likely to know the answer to, and then guess as to the solution.

Since you are paying a service provider you may as well get your money's worth and ask them.

PS I've just realised this may sound rude or condescending - it's not intended to, however in this case asking your service provider is probably going to be the quickest way to get the problem fixed, assuming they are a helpful, responsive service provider.


Based on the "hints" (cPanel/WHM) in your question, my best guess is that you are trying to use your web-hosts SMTP-server instead of the SMTP-server provided by your ISP. Try using where myisp is the domain-name of your ISP.


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