I need to route mail to a universal distribution group. I have created the group and entered contacts to it. It is working fine exept for one specific domain, and only when a user from that specific domain tries to send a mail to the distribution group. I get an error on the sender address as non existent, but only for the users on that particular mail domain. 4 users contact information points to a mailbox in the problematic domain, and those four addressees generates the error. But I can without problems do a "send again" to the four adressees (in outlook from my administrator account) and wupti - the delivery is ok. I have access to the mail domain as secure smtp user and I am able to send mail to the domain including if I send mail to the distribution group from my account on the problematic mail domain, but all mail from my domain will go through that particular virtual smtp server - and is therefor relayed through the problematic mail domain server. I do not want all my mail to pass through that mail server. My default smtp virtual server sends and listens on port 25 Only. So here is what I want:
Mail for problematicdomain.com to be sent through specific smtp virtual server comunicating on port 587. The extra smtp virtual server should only handle outgoing mail from my serrver to the problematic domain, including outgoing mail to the distribution group. All incomming mail should be handled by the default smtp virtual server only.
All outgoing mail for any other domain should be sent through the default smtp virtual server on port 25.