I have Exim on server with test@domain.com email. And now i'm sending email to test@domain.com from test2@domain.com but using provider SMTP and i'm getting following error:
Failed: test2@domain.com → test@domain.com 'Microsoft Office Outlook Test Message' Server response:
550 550 Verification failed for <bounce+2db7fb.5fc31-info=test@domain.com> Unrouteable address Sender verify failed
How can i put my SMTP (sender) to white list?