ServerOK

554 5.7.1 Unknown Sender in Local Domain

Written by Yujin Boby

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When sending an email from one server to another, the email gets bounced with an error

SMTP error from remote mail server after MAIL FROM: SIZE=1575: 554 5.7.1 Unknown Sender in Local Domain .

The error is because both servers have the sender domain name configured. The solution is to remove the domain name from one of the servers.