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this post was submitted on 12 Jun 2023
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I disagree. You can take some amount of downtime without issue.
https://wpmailsmtp.com/docs/how-to-automatically-resend-a-failed-email/ as an example for some services.
Many services (including postfix by default) will attempt a number of resend operations before it gives up.
What? All email is federated. What are you talking about here? SPF/DKIM/DMARC are on top of email... and have nothing to do with the federated property of email. Federation does not mean that you login or use another server. But that you have your instance, and the servers hash out the cross communication amongst themselves. That's EXACTLY what email servers do using SMTP.
If your email wasn't federated then you would get emails from anyone outside of your own instance. That would make email useless for 99% of the world.
I take "federated email" to refer to a juxtaposition with normal email implementation which harkens back to how it was in the 90s or early 00s where you didn't need to be registered on many SMTP servers in order to use it and it's stripped of server-side validation. There's some discussion on this topic in the fediverse.
You're right that the default current implementation is already federated.