None. If you wanted paid you would've charged for it.

How many of you all here, using a hosted solution remembered to setup DKIM on their custom domain? hostname alignment can aid in email deliverability, i believe.

For reference, if you were using office365 you would take the steps outlined here: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dkim-configure?view=o365-worldwide

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Lastly... if you don't bother, any good reason to skip the domain alignment step?

if you must, have you looked at the azure application proxy? if you configure it properly it should work from the outside world, and still remain private. This does put a lost of trust into azure, and your tenant's users not getting broken into.

dont host anything you cant properly secure.

When it starts to carry any level of production workload from an outside network :)