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Email Sending Failed - SMTP connect() failed.


xamber

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So i've been trying everything, no encryption, SSL, TLS.

Several different emailadresses.

I've checked multiple times that the information i'm supplying WHMCS is correct.

Nothing works in whmcs regarding mail, and i do not want to use phpmail..

 

I'm the host of the mail and i can guarantee that the mail server and dns servers are working perfectly since i'm using them daily. It's just comes to an halt when trying to send mail from whmcs.

 

We need to solve this, since i can see a lot of people having the same troubles but none can offer an true solution.

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nat reflection? whuts dat?

 

Well basicly ut blocks so you can't look up the DNSrecords that are pointed at your public ip. Turn that ON (nat reflection in your router) and it will look up the DNS which will solve it. How ever this can be an security issue since it opens up an DNS rebind exploit that can screw things up, so since whmcs is hosted on my Cpanel machine I just used 127.0.0.1 for the SMTP host.

Problem solved.

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  • 3 months later...
Well basicly ut blocks so you can't look up the DNSrecords that are pointed at your public ip. Turn that ON (nat reflection in your router) and it will look up the DNS which will solve it. How ever this can be an security issue since it opens up an DNS rebind exploit that can screw things up, so since whmcs is hosted on my Cpanel machine I just used 127.0.0.1 for the SMTP host.

Problem solved.

 

I had a similar problem and on changing the SMTP host to 127.0.0.1, it worked. Thank you for sharing that information.

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