Cannot Send e-mails, Does Not Allow Relaying; Fix - AppleToolBox
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Fix Problems Sending Email on an iPhone or iPod Touch - Telnet Communications
Cannot Get Mail" errors on your iPhone? Try this fix
Email address rejected by server" - Quick fix for this error in your iPhone
Unable to send email on Mail app - Apple Community
Apple Device Stopped Sending Email - 'Cannot Send Mail - A copy has been placed in your Outbox. The Recipient {name} was rejected by the server.' | PeteNetLive
Failed to Send or Receive Emails on iPhone [Fix]
iOS 16.5.1 Cannot Send Email From iPhone Mail App, Outgoing Server Failed