The sender address was invalid
Email from my own domain name works fine on iPad iOS 16.2 but using EXACTLY the same set up details, including the optional username and password for the outgoing server settings, in my iPhone 12 iOS 16.2 returns the error “Cannot Send Mail. The sender address was invalid”
Clearly this is an issue on the iPhone only. iPad works as expected.
Using iOS Spark on iPhone to send email works ok too.
So unsure why this is suddenly a problem on my relatively up to date iPhone.
Have tried pretty much everything!
iPhone 12