Mailgun Secure SMTP Test Failure

Did you end up getting things working?
This is the exact error I started with.
I’ve since moved onto other errors, but it’s still not working.

There are also two more unanswered posts (at least) regarding the same and related problems.

* http and smtp both fail
* Mailgun null Test Unauthorized

I was going to open a support thread more as a advisory than a request for support.

One of our clients are using Mailgun, all working fine. Their dedicated server was still operating with PHP 5.4. We upgraded the server to PHP 5.6.x and after that email stopped being sent to Mailgun. Nothing.

After spending many days with support at Mailgun, finally I added the ‘Postman SMTP’ plugin, ran the set up and “Bingo” started sending email through Mailgun again right then.

Would be interesting to find out if you guys are using PHP 5.6.X. That is the only common denominator that make sense at the moment.

Check the username in the Mailgun Plugin SMTP settings. In my case, the username is being truncated at the @ sign:

[email protected]

becomes

postmaster

It’d be nice to have a fix sooner rather than later.

The problem is that the plugin is using smtp.mailgun.net as the SMTP server – the server is smtp.mailgun.org if you look at their documentation.

• This reply was modified 8 years, 2 months ago by eclev91.

Thanks @eclev91, changed the following on line 73 of mailgun.php from

$phpmailer->Host = 'smtp.mailgun.net';

to:

$phpmailer->Host = 'smtp.mailgun.org';

Now the test is succeeding.

@wmboy Glad that worked.

@karthost I definitely found that it depended on the version of PHP that was running, but it’s been a while and I don’t remember my findings. I filed a ticket with Mailgun proper, but nothing was resolved.