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My aunt's Mail App on her MacBook Air suddenly sends this message without prompt. We have deleted and re-added her email account to the Mail App but it didn't fix it. The current workaround is to access her email through a browser but looking for a fix. We've also checked the server to be "smtp.mail.att.net" -- but it still didn't fix it. Thank you!
MacBook Air (M1, 2020)
Hey Ferrona Lie,
Welcome to Apple Support Communities.
We see that the email domain is "@sbcglobal.net". Make sure the the outbound port has the correct information. The outbound port is provided in the link from AT&T which handles "sbcglobal.net": POP3 and IMAP Email Settings - AT&T.
Here's a link that provides steps on setting up your email account in the Mac Mail app: Set Up or Update AT&T Email - Apple Mail (OS X).
We suggest deleting the email account, and then follow the steps in the link to ensure all information information is correct.
Hope this helps. Take care.
cannot send message using the server yahoo - sbcglobal email
