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wag357

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I'm having a weird issue with some sending domains.
I have various users reporting that they can't get email from anyone at certain domains. For example, my purchasing mgr can't get email from anyone at one of our vendors, but he gets other emails from other vendors all day long.

The sender never gets any failure message and my Kerio server shows no entries from the sending domain. None of the logs show anything and I have EVERY logging option turned on. It's as if the sending mail server never even TRIED to connect to me.

This only happens from some domains 99.9% of incoming emails are fine and get delivered properly.

I have the mail server listed in reverse DNS so it isn't that the remotes are doing a reverse lookup and not finding us.

Anyone have ANY thoughts?

Thanks!
Walt
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hinnerup

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Could it be, that they are caught by one of the blacklists? Can you confirm, that you have logging enabled for all blacklists with blocking enabled? (Configuration/SMTP Server/Blacklists).

/Tobias
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wag357

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I had logging enabled for all the blacklists but not blocking.

I turned off logging yesterday for lack of anything else to try.
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hinnerup

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I would try making a telnet connection from one of the affected domains' network to your mailserver. That would determine

a) Any errors from the "client side"
b) Whether a (possible) rejection is indeed ignored by the Kerio loggin service.

/Tobias
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freakinvibe

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Can't be the blacklists because the sender would then get an error message.

I'd rather think it could be an DNS MX record problem, if the client can't connect, it maybe goes to the IP address of the backup mailhost. How do your MX records look like? Do you have more than one?

Regards, Pascal

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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wag357

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hinnerup wrote on Sun, 29 August 2004 10:16

I would try making a telnet connection from one of the affected domains' network to your mailserver. That would determine

a) Any errors from the "client side"
b) Whether a (possible) rejection is indeed ignored by the Kerio loggin service.

/Tobias


I haven't been able to get any of the senders to do a telnet. but, I tried from home and I can't get a session open. I keep getting connection refused from my telnet client. My home machine is DMZ so I'm sure it's not port blocked on my home router.

I thought mail servers communicated through telnet. If so how is ANY mail getting through if a telnet session can't be opened?
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wag357

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It would help to telnet to the right port! :)

I'm half asleep and obsessing over this problem. :(
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