Editing Introduction to a Self Managed Life: a 13 hour & 28 minute presentation by FUTO software (section)

== Step 7: Verify SMTP Relay Setup ==

# '''Test Email Delivery''':
# Once the configuration is saved, send a test email to ensure Mailcow is using Postmark to relay emails successfully. I would suggest sending your test email to four addresses:
#* Email to yourself (same email in Mailcow you are sending from).
#* Email to another mailbox on Mailcow.
#* Email to a “friendly” server, i.e., something not hosted by the main mega providers (another person who hosts their own email).
#* A Gmail/iCloud/Microsoft email address.

Each one tests a portion of the chain.

* If 1 doesn’t work, you’re hopelessly screwed.
* If 2 works but not 3, perhaps a network problem.
* If 1, 2, &amp; 3 work but not 4, you’ve likely screwed up something in the SMTP relay or DNS records process, but the networking configuration and Mailcow setup in general is mostly working. It’s also possible that you did everything right, but Google/Apple/Microsoft still hate you. It’s ok. You can’t hate them back though. As my first studio employer told me, ''“Louis, you hate nothing, you intensely dislike it!”''

If all 4 work, great! If you get something like this in your email when sending, you made a stupid typo when setting up SMTP relay. Can you find mine?

<pre> &gt; This is the mail system at host mail.louishomeserver.chickenkiller.com.
  &gt; I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message.
  &gt; The mail system
  &gt; &lt;rossmanngroup@gmail.com&gt;: Host or domain name not found. Name service error for name=smtp.postmark.com type=A: Host not found
  &gt; &lt;louis@rossmanngroup.com&gt;: Host or domain name not found. Name service error for name=smtp.postmark.com type=A: Host not found</pre>
This concludes the guide on setting up Postmark as an SMTP relay for your Mailcow server, configuring DNS records, and setting up firewall rules. Remember to double-check all your configurations and test thoroughly to provide everything is working as expected. Or, don’t &amp; give up. The latter is recommended.

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