SMTP broken after update

API and Non-secure SMTP still works.

Confirmed it is not a firewall issue by using another mail plugin and successfully tested port 465/SSL and 587/TLS.

Please advise.

• This reply was modified 7 years, 2 months ago by accunet.

Hi @accunet,

I’ve added an option to the admin page that should let you set the SMTP security type. I have not released it yet, but could you please test out this beta and let me know if setting the security type to 'ssl' fixes your issue?

[ Signature deleted ]

• This reply was modified 7 years, 2 months ago by Mailgun.
• This reply was modified 6 years, 3 months ago by Jan Dembowski.

Hi Sean,
Yes setting to SSL works, TLS fails.

Can you make the update default to SSL ?

Also request you to include the security type in the last line of the test email:
“The method used to send this email was: Secure SMTP.”

Thanks!

• This reply was modified 7 years, 2 months ago by accunet.

Hey @accunet,

I can’t change the default to SSL, as the traditional SSL protocols are not recommended for continued use. We recommend that all users use TLS for SMTP connection whenever and wherever possible.

Thanks for testing the beta. I’ve added the security type to the end of the test email as well. I’ll cut this release soon.

[ Signature deleted ]

• This reply was modified 6 years, 3 months ago by Jan Dembowski.

No problem. Thanks for the quick reply.

Why do you think tls won’t work with MailGun’s plugin, but tls will work with a different plugin? Is it a server setup?

@accunet I am not entirely sure why that happens. It could be a bad TLS set up on the machine running your WordPress instance, but then the other plugin using TLS shouldn’t work either…. I suppose it could be a PHPMailer issue – Do you know if the other plugin uses PHPMailer for sending via SMTP?

Update: Tried another plugin where the test shows debug info, and yes it is using PHPMailer.
**********snipped from debug output*********
/var/www/html/wp-content/plugins/wp-email-smtp/wp_email_smtp.php:220:
object(PHPMailer)[1856]
public ‘Version’ => string ‘5.2.22’
************

• This reply was modified 7 years, 2 months ago by accunet.

Having the same issue here. Switched to a different plugin and TSL was working fine with Mailgun SMTP.

Tried it on different servers and hosting companies same issue.

@mailgun,
Are there certain libraries you are relying upon? I can try to research further with the hosting co.

Thanks!

I just tested the “beta” version of the Mailgun plugin linked to above and it seems to have solved my issue if I use the “SSL” setting for Security Type.

One additional piece of information from the “Connectivity Test” feature of Postman SMTP. That test shows the following:

Port 465 open (25 and 587 are closed)
SMTPS service available (not 100% sure, but am guessing this would show STARTLS if that service was detected as available)
Login and Plain authentication available

Hi-
Can we get an update with this plugin? You recommend TLS (and I’ve read the same elsewhere), but this pluing doesn’t work for me and other people here using TLS.

Options are unsecure connections using latest version of plugin or
secure SSL using beta plugin.

Would it be better to open a ticket with MailGun to try to resolve?
Thanks
Paul