X-Files SMTP

The past few days have been hectic trying to resolve a weird SMTP issue at a client’s site; brand new Win2K3 server, Domino 6.5.1, firewall all in a relatively standard configuration. But, some SMTP emails from some hosts just don’t come through; they show up as the ‘…connected, 0 messages received’ in the Domino logs. Clients were complaining that Domino was responsible, so we were forced to put in a MS SMTP server and the problem persisted there too (so the problem is not Domino). There’s some discussion going on in the R6 forums about it, and Chris Linfoot’s site has some useful tips, but still no solution.

We changed some SMTP settings on Domino like turning off the ESMTP pipelining extension and some others, but still no go… Changing the TCP MTU on the server is one of the other suggestions (but we haven’t tried that yet as it would affect a number of other things). So what on earth is going on? This one is surely for the x-files team.

chris on July 22nd 2004 in Uncategorized

5 Responses to “X-Files SMTP”

  1. [jc] responded on 23 Jul 2004 at 10:49 am #

    AusPOst offer a good service. You put the document in an envelope, stamp it and put it in a big red box on the corner of the street. I hear it works really well.

  2. chris responded on 23 Jul 2004 at 1:02 pm #

    Does that service still exist? It must be only the faithful that remain :) That way you can collect say, stamps as well if you wish!

  3. Chris Linfoot responded on 06 Aug 2004 at 8:47 pm #

    You should try the MTU size. Almost always works in these scenarios.

  4. Mike Munnis responded on 09 Oct 2004 at 8:11 am #

    I think changing the MTU size is a good start for testing. Once upon a time we used Ascend routers. They couldn’t handle MTU larger than ~1500, and Domino sends ~2xxx. Changing the server registry to use 512 MTU worked.

  5. Dianna responded on 13 Oct 2004 at 6:21 am #

    I’ve tried all the suggestions with no luck. And it is starting to affect more and more companies that we are trying to receive emails from. If anyone at all has any ideas on how to fix this, please reply back. Our final option is to rebuild the notes server, as someone suggested to me that something might be corrupt on the server itself!!