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The message could not be sent because one of the recipients was rejected by the server.
The rejected e-mail address was 'email@example.com'. Subject 'test', Account:
'mail.e-domainserver.com', Server: 'mail.e-domainserver.com', Protocol: SMTP, Server Response:
'450 Client host rejected: cannot find your hostname, [184.108.40.206]', Port: 25, Secure(SSL):
No, Server Error: 450, Error Number: 0x800CCC79