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5.7.1 : Sender address rejected: not owned by user · Issue #94 · magepal/magento2-gmail-smtp-app · GitHub
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554 5.7.1 : Recipient address rejected: NO-DOMAIN' error message -Hosted Email Security 3.0
Messages returned; Error 550 - Connection Rejected. Your IP is in RBL - MSOutlook.info
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Fix email delivery issues for error code 550 5.1.10 in Exchange Online | Microsoft Docs
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Mailbox name not allowed. The Server response was: 5.7.1 <sender@abcd.com>:Sender address rejected:not logged in - Stack Overflow
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Email address rejected by server" - Quick fix for this error in your iPhone
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