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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?

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migrated from stackoverflow.com Sep 28 '09 at 11:06

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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 serverfault.com. Put this question there and am glad to have that in my bookmarks now. –  Susan Jul 23 '09 at 6:50
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2 Answers

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.

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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 smtp.myisp.com where myisp is the domain-name of your ISP.

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