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


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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Bruno PACIIT ConsultantCommented:

Mail routing in Exchange 2000 and Exchange 2003 has NOTHING to do with AD site links.

Exchange 2000/2003 use its own routing connectors.

You have to look at the Exchange Routing Group Connectors to check for any delivery schedule.

Have a good day.

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It can be a filter/firewall or AV which is causing scanning all the messgae & there gets delayed.
Also,check if dns is properly working.
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