# Can’t send emails due to failed internal dns resolution

**URL:** <https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592>\
**Category:** Product Support\
**Created:** [May 3, 2016, 8:45am UTC](https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592 "2016-05-03T08:45:48Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![gvalchca](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/gvalchca/32/44015_2.png) [@gvalchca](https://meta.discourse.org/u/gvalchca)\
**Post date:** [May 3, 2016, 8:45am UTC](https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592/1 "2016-05-03T08:45:48Z")

</div>

Dear Discourse community,

Im having problems with my instance of Discourse. Although the servers parameters didnt change, and I am able to use them e.g. via simple Python script, the Discourse fails to send emails.

It happened all of a sudden about a month ago after an update. I have rechecked the server parameters, apart from that I’m completely lost.

Here is an error log:

```
/usr/local/lib/ruby/2.0.0/net/smtp.rb:784:in `check_auth_args'
/usr/local/lib/ruby/2.0.0/net/smtp.rb:548:in `do_start'
/usr/local/lib/ruby/2.0.0/net/smtp.rb:520:in `start'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/mail-2.6.4/lib/mail/network/delivery_methods/smtp.rb:113:in `deliver!'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/mail-2.6.4/lib/mail/message.rb:2149:in `do_delivery'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/mail-2.6.4/lib/mail/message.rb:237:in `block in deliver'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:543:in `block in deliver_mail'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.6/lib/active_support/notifications.rb:164:in `block in instrument'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.6/lib/active_support/notifications.rb:164:in `instrument'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/actionmailer-4.2.6/lib/action_mailer/base.rb:541:in `deliver_mail'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/mail-2.6.4/lib/mail/message.rb:237:in `deliver'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/actionmailer-4.2.6/lib/action_mailer/message_delivery.rb:85:in `deliver_now'
/var/www/discourse/lib/email/sender.rb:148:in `send'
/var/www/discourse/app/jobs/regular/user_email.rb:41:in `execute'
/var/www/discourse/app/jobs/base.rb:154:in `block (2 levels) in perform'

```

---

_[View the full topic](https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592)._