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McIrish

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I know this is very vague, but I'm having some trouble receiving email from a vendor. It appears they have reports sent to us via some other service. I don't see any entries in the mail log for those reports. I've added what I think is the public IP of the sending server to our whitelist. Still, I don't see any email coming in from them. I can have them send it to my personal account and I get it just fine.
Any ideas on how to track this down?

Thanks
Tom
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tonyswu

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I would probably start by reviewing the header of the email that successfully went through to your personal email account. It should have plenty of information in there in terms of whitelisting needs. Then I would take another look at the log (spam log as well) and see if you find anything there.
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clan

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The debug log may give some hints as well. Can you contact their service provider to find out if they have something on their logs?
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McIrish

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Thanks for the replies. I did go through every log and searched the sender and sender address. Nothing came up. Its an odd case and I haven't found a way to track it. I guess I will need to contact the sender and see if they get anything in their logs.
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McIrish

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I finally found a line in the security log that matches up.
Client with IP address xxx.xxx.xxx.xxx has no reverse DNS entry, connection rejected before SMTP greeting.

How would this be cured? Their IP address is in the whitelist and all spam modules are setup to use the whitelist.
Ideas?

I don't want to turn off checking for reverse DNS except for this one exception. Can it be done?

[Updated on: Fri, 16 August 2013 22:01]

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tonyswu

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I know people hate being told that they are wrong (myself included), but you need to tell the sending party that they need to get this resolved. A mail server without reversed DNS is like a business man without a business card. Not going to work. If they are unwilling to address this issue, then you have to either disable it (can you even do that in Kerio?), or have them send to your personal mail account, and use some sort of filtering rule to forward that to your work account. or some other similar workarounds.

[Updated on: Fri, 16 August 2013 22:31]

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McIrish

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I agree with you. This, is a huge company that sends out 10,000+ emails per day in some automated system. The emails are mission critical for us. It could be easily cured if Kerio included a whitelist option in SMTP Server/Security Options/Additional Options
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perbauer

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Check your setting in Config / SMTP Server / Security Options, there's a checkbox called "Block if client's IP address has no reverse DNS entry (PTR)".
I don't have it checked here, we deal with many small companies that not always have their reverses set, ie I cannot check it. Luckily it has not meant any major increase in spam because of it.
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