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I literally highlighted every paragraph of this post. So many things to agree with.

I'm really looking forward to the breakdown of much of what has been teased here.

Top of mind: Is Postal the self-hosted transactional mail server (https://github.com/postalhq/postal)? Been looking at using this for an idea, and wanted to know if there are any obvious gotchas to look out for.

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Postal is an amazing project. It just works out of the box. No much config required apart from the DNS. You can set the postal worker/thread count on the Postal config and Mysql connection count based on your machine and that would do. Finding the right numbers based on the CPU/RAM would be trial and error. We were able to achieve over 100 mails/sec on a 36 core system.

Their github issue tracker is pretty active: https://github.com/postalhq/postal/issues/

This was a discussion we had regarding scaling of postal: https://github.com/postalhq/postal/issues/697

On the same line, you should checkout https://listmonk.app/ by @knadh and we use it internally for sending email to our over two million users.

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