This is probably best described through anecdote: my default send-from address in Mail on iOS is my @DavidChartier.com account. But if I type the first couple letters of an AgileBits colleague in the To field, then select the suggested contact from my address book with an @AgileBits.com address, Mail switches my From address to my Agilebits account.
I tinkered with this a bit to try and figure out what logic Mail is using, but I can’t pin it down. For example, I set my default account to iCloud, then tried drafting messages to some of the @DavidChartier.com aliases I use for things like contact forms. Mail does not automatically switch my From address to my @DavidChartier.com account, and I think it’s because none of those aliases are tied to a contact in my device.

If anyone has a better explanation of how this works, I’m all ears.

[via Rune Madsen]
You May Also Like

📱💻 Safari can translate webpages without a plugin

Basic translation tools are built right into Safari on Mac, iPad, and iPhone.

How to cut down on iMessage group chat notifications with mentions, hidden alerts, threads

Group chats are great, and iMessage is pretty great. But getting a…

Little features that could make a big difference in iOS and iPadOS

I have a growing list of little features that I hope Apple will add to iOS someday. Since WWDC 2021 was not that day, I’ll share them here.