Currently, we�re running Exchange 5.5 SP4 with hotfixes on an NT4.0 SP6A servers. We have 2 mailbox servers with one IMS/Bridgehead server. One of the mailbox servers also has an IMC with a cost of 99 as a �just in case� scenario. Currently, our Internet mail comes through the UNIX firewall which performs a relay function using post.office. The firewall is going to be changed and will not perform this relay function any longer. Currently, our ISP performs queuing for us for up to 4 days worth of mail should our site be unavailable. My question is this: Since we will not longer have this relaying function from the UNIX firewalls, the mail will go directly via port 25 to the Exchange IMS/bridgehead server. The UNIX administrator insists that it is a good idea to put a UNIX Sendmail server in between the firewall and the Exchange server for queuing purposes, however, I don�t see the need for it. Can someone please explain to me if this UNIX server is necessary? To me it seems like an extra hop for no reason.
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