Re: Cannot receive email from several clients in the same domain...

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MikeMike <mikolay@xxxxxxxxx> wrote:
On May 13, 9:35 pm, "Martin Blackstone" <mart...@xxxxxxxxxxxxx> wrote:
The fact that it never gets to your Exchange server makes me question
CloudMark.
Is there any way you can get access to the SMTP logs for your domain
from them?
It just seems strange that they see a successful send but you see
nothing and there is a man in the middle (Cloudmark).

"MikeMike" <miko...@xxxxxxxxx> wrote in message

news:5840d4f7-fac2-44eb-8468-6a241734f207@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Greetings,

Hosting our own email through Exchange in SBS 2003. We moved our
server in an office move on March 28th and ever since, we've been
unable to receive mail from several clients within a division of a
large company. I have been working with their IT department to
troubleshoot and can receive email from the techs and IT folks
within the same company (and same domain mind you) so it is not an
issue of the domain being blocked in any way. They say there is no
problem on their end. We seem to be receiving email fine from
around the world and no one else is or has complained that we are
not receiving their mail. Only using Cloudmark for spam detection
and have whitelisted domain so I don't think it's that. Have
enabled logging and never see an attempt from the sender's server's
communicating with my server so no error's to troubleshoot. I do
see the successful connection in the logs of the IT folks email
traffic when they send email. Clients that we cannot receive email
from all work at same location and appear to be using a different
sending server from the IT techs in their company when I review the
headers from messages that we receive to our personal accounts
(this is the only way we can talk to them via email now which is
obviously a pain). My client's IT department did check their
Exchange servers and could not find any problems. They also
supposedly checked their DNS settings etc and also said that their
nameservers are finding the new address of our mail server. I am
completely perplexed since our clients do not get any NDR's that
could give me any additional clues. Needless to say, my client and
several others within my organization are getting pretty PO'd that
they cannot receive mail from this client. By the way, they
receive the email we send them just fine. Any and all hints, help,
etc. would be greatly appreciated!

Best,
Mike

First off, apologies for cross posting...

Actually, crossposting = good. Multiposting = bad. :-)

Please rack that up to my
level of frustration over this issue.

Secondly, Cloudmark resides on my server and does not touch the
messages until after they are processed into the server. Therefore,
any spam filtering is logged and spam is individually moved to a
central spam folder. Both of those have been checked and rechecked
for any catches by Cloudmark for those folks and nothing is seen or
found.

Best,
Mike

As I suggested in my reply to your (multi)post in the other group, ask the
other admins to show you the SMTP logs that show the attempt to connect plus
the results. Right now it's their word against yours -and you don't have
anything in your logs to show it's hitting.


.

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