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Small Business Server Support Forum    
Forums > Microsoft Small Business Server 2003 & 2000 > Exchange Server 2003
Subject: Slow receiving SMTP mail.
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Bob Coleman User is Offline
United Kingdom
Member since
6/15/2006

Registered Users
Posts: 10
7/26/2006 10:23 AM  
Hi, I wondering if there is a setting I have missed in Exchange 2003.

I have recently moved from sbs2000 to a new machine running sbs2003.

I have a backup MX server which catches all our e-mail at the ISP end if for any reason our server is down, this usually collects about 1000 messages a day on it (ALL spam as spammers like delivering to the last MX record for some reason)... A couple of times a day on the old server we used to send a "finger" command to get the backup server to send them messages to us, this took usually around 40 seconds.... and all were delivered to the server.

On the new server however, the backup server is only able to send 1 message every 30 or so seconds to us, meaning that the download of messages is taking hours rather than seconds...

I've checked the default SMTP sever properties, and the limits set there are to limit it to 5000 connections and number of messages per connection to 2000 and all appears ok. We are receiving from multiple connections and accepting 10,000 or so messages a day with no problem, it just receiving 1000 messages from 1 source that appears to be the problem.

Now as I say - this is 99.9% spam messages only, is there some sort of exchange tarpitting that is going on which means because of the high amount of spam coming from this connection it slows the acceptance of e-mail down? Or perhaps because there are so many unknown addresses it is trying to send to that it slows the acceptance of mail down?

Certainly with the old 2000 server, it used to stream straight in, with no issues (we can see the bandwidth utilisation on the router stats shoot up during delivery) however with the new 2003 server it is literally just a 0.2Kb/sec stream with lots of pauses.

Any one experience anything like this before?
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Forums > Microsoft Small Business Server 2003 & 2000 > Exchange Server 2003 > Slow receiving SMTP mail.


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