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How can I solve the problem in 1 mail?

The error is "The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'anvarcheruputhoor@gmail.com'. Subject 'TEST23', Account: 'mail.greenix.in', Server: 'mail.greenix.in', Protocol: SMTP, Server Response: '530 Relaying not allowed (please enable smtp authentication on your email client)', Port: 25, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC79"

Public Comments

1. Possibility the email address no longer exists? or the recipient's mail box is full? Check the address and if you know the individual ,, ask them to check with there server. Good Luck