I noticed that there was an update from @ghost/@Hannah at the pull request.
Since not everybody might be following that, copy below:
Hey @peterpacket
Really appreciate the intention here, and I can see you’re putting effort in so wanted to flag up right away - we wouldn’t merge this change from a single PR.
We’d want to put together a plan for how to make the two integrations play nicely together, a test plan for how we ensure it works, and we’d also need to discuss long term maintenance.
If this is something you’re committed to, then perhaps raise an issue with a plan?
Postmark integration by peterpacket · Pull Request #22771 · TryGhost/Ghost · GitHub