Re: Problem with emails from some incoming domain

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From: Jay (test_at_test.com)
Date: 12/08/04 

Date: Wed, 8 Dec 2004 11:54:43 -0800

Still need confirmation but I think we found the problem. See MS article
322358 for details. There's a domain name added to the "Deny connections
from" list which causes Exchange to check all e-mails for reverse lookup. By
deleting that domain name, e-mails seem to come through now. Just wait for
confirmation from clients.

Thanks again for all your help!

Jay

"Lanwench [MVP - Exchange]"
<lanwench@heybuddy.donotsendme.unsolicitedmail.atyahoo.com> wrote in message
news:%23oF8XwU3EHA.2012@TK2MSFTNGP15.phx.gbl...
> Jay wrote:
>> Thanks Lanwench for your reply.
>>
>> None of the senders get NDR.
>>
>> The GFI log shows that emails from those domains before a certain
>> date end of Oct., and after that no more emails in the log. Sounds
>> like something happened at the end of Oct and no more emails come
>> through from those domains.
>>
>> Appreciate your thoughts.
>
> Can you whitelist the domain(s) in GFI and have the senders test again?
>>
>>
>>
>>
>>
>> "Lanwench [MVP - Exchange]"
>> <lanwench@heybuddy.donotsendme.unsolicitedmail.atyahoo.com> wrote in
>> message news:O0fHP6J3EHA.2540@TK2MSFTNGP09.phx.gbl...
>>> Jay wrote:
>>>> Greetings,
>>>>
>>>> Recently users complaint that they couldn't receive some emails from
>>>> certain domains. Since our Exchange server requires DNS reverse
>>>> lookup for incoming messages,
>>>
>>> I don't recommend this....
>>>
>>>
>>>> we discovered that some remote domains
>>>> doesn't have reverse DNS entry for the MX record. By adding the
>>>> Revese DNS, we can receive emails from those domains now.
>>>>
>>>> However, since we don't have the problem before, and of course the
>>>> remote mail severs are not in our juristication, I couldn't add
>>>> reverse DNS records for all remote domains.
>>>>
>>>> I have tried to disable the reverse dns lookup option under Default
>>>> SMTP Virtue Server, stop/restart SMTP service, but those emails
>>>> still doesn't get through.
>>>>
>>>> My question is, would reverse DNS lookup really block incoming
>>>> emails in Exchange 2000?
>>>
>>> It could...and I wouldn't use this. It makes mail delivery slower.
>>>
>>>> If yes, how can I turn off this option (do I need
>>>> to restart the server?)
>>>
>>> I don't think so, but again, we don't know for sure this is the issue
>>> anyway.
>>>
>>>> Since I haven't made changes recently, why did it happen?
>>>>
>>>> Our enviroment is Win2K server + Exchange SP3 with GFI
>>>> MailEssentials and TrendMicro Scanmail, single Exchange server.
>>>>
>>>> Any thoughts?
>>>>
>>>> Thanks,
>>>> Jay
>>>
>>> What is the exact text of the NDR the sender gets?
>>> Have you checked your GFI logs?
>
>

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