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I am getting "Invalid Reference(SMTP Error) ()" for messages sent all yahoo.com emails using MLK internal server. I disable antivirus and firewall but result is same.
Is it just Yahoo emails, whereas others go through fine? In that case, the Yahoo mail server may recognize Hotmail may recognize that your sending has originated from a local mail server and be rejecting.
It is important that if you are using the SMTP Server that you specify the option to automatically resend to any recipients that fail, and specify that the last sending attempt should be via normal SMTP.