550 The recipient cannot be verified


Eventually, you may recieve following error: 550-"The recipient cannot be verified. Please check all recipients of this 550 message to verify they are valid." (in reply to RCPT TO command).

All our servers built with "Verify the existance of email senders" feature. verify = sender checks whether a senders email address can be replied to and email sent from REAL email address, if not the verify fails. If user is trying to send email from user@domain.com but actual mail server is mail.someotherdomain.com, verify will fail. 

If you need further assistance, please submit support ticket: with entire mail headers.

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