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Can adding SMTP to an AD site link delay an email queue

Last Modified: 2012-05-09

Recently my primary Exchange 2000 mail server started having significant delays (5-20 minutes) in the (Remote delivery) queue to an Exchange 2000 server in another site.  We would see the queue start to fill up with messages and seemed to release them on a schedule, though I couldn't pin that schedule down.  This impacted both internal and external messages.  One of the things I stumbled across was that the AD site link to that remote site had both the IP and SMTP protocols added under "This server is a preferred bridgehead server for the following transports".

Is it likely this had anything to do with the delayed message delivery?  I do not know if an administrator mistakenly added that protocol recently.
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