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When I try to send an email on my iphone 11, I frequently get "cannot send email" and "Sender address invalid". I have deleted my email provider and re-installed it.
This does not happen when I try to send via gmail.
iPhone 11, iOS 14
Hello bjones1764,
Welcome to Apple Support Communities. We understand you receive errors sending mail through a specific account on your iPhone. You may need to confirm the settings you have for the outgoing and incoming mail server are correct.
Use this helpful guide to check mail settings:
You might also want to confirm your login through your mail provider website login.
Have a good day.
Sender address invalid
