Unable to Recieve Emails from a Few Clients

Hi,

I can not receive emails from a handful of clients I am in the process of trying to get them to send me the the bounce back emails but i do have one already from a client and it has <#4.4.7> #SMTP# this error. Any ideas would be appreciated I'm stumped.
 
c32ax1Asked:
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Alan HardistyCo-OwnerCommented:
Okay - I don't see any issues with anything in either the test email or the email headers.

I have Exchange 2010 but don't use the built-in Exchange Anti-Spam software as it didn't work for me and was a pain to work out easily what happened to a mail that got rejected, plus I have been using Vamsoft ORF prior to switching to Exchange 2010 and prefer to use Vamsoft on Exchange 2010 as it works!

I would personally disable the Exchange Anti-Spam for a period, then get the client to send you a test email and see if it arrives.

If it does - enable one test at a time and then ask for another test email.  Keep this going until the test message bounces and then we might be able to see what it fails on and try to fathom out why.
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Alan HardistyCo-OwnerCommented:
Are you using the in-built Exchange anti-spam tools, a third party product or a 3rd party filtering service to spam-filter your mail?

Do you have a hardware antispam device such as a Barracuda installed as the error does not look like an Exchange error?
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c32ax1Author Commented:
Just the built in anti spam tools in Exchange
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Alan HardistyCo-OwnerCommented:
Ah - not good!

Can you disable them, restart the transport service, and ask the senders to re-try please.

Do they come through now?
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c32ax1Author Commented:
Ok been working with some of the clients that we cant receive from and this seems to be the smtp dnr msg most often seen 4.4.7 smtp;550 4.4.7 QUEUE.Expired; message expired
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Alan HardistyCo-OwnerCommented:
Hmm - that's a normal NDR if they are not configured properly, or you are rejecting them part before they transmit the email.

Can you ask one of them to send a test email to me please at alan @ it-eye.co.uk and let me know when it has been sent.  I'll keep an eye out in my anti-spam logs and see what their problem is - most probably bad configuration their end :D
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c32ax1Author Commented:
Ok I am going to get one maybe more of the clients to shoot an email to your address also how do i check to make sure they aren't black listed by the anti spam software in Exchange?
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Alan HardistyCo-OwnerCommented:
You can change the Exchange Anti-Spam settings to whitelist them by IP in the IP Allow List.
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c32ax1Author Commented:
I received the DNR from one of the clients mind if I shoot it your way ?
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c32ax1Author Commented:
I'm not sure what which IP to allow
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Alan HardistyCo-OwnerCommented:
Sure - feel free.
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Alan HardistyCo-OwnerCommented:
No probs - I'll have a look and let you know.
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c32ax1Author Commented:
Sent The title is "Lunch Order for March 22nd"
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c32ax1Author Commented:
had the same client shoot you an email titled "test email"
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Alan HardistyCo-OwnerCommented:
Email with headers received - checking that.  Other email got greylisted - so waiting for next attempted delivery before seeing if my server doesn't like it!

Back soon.
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Alan HardistyCo-OwnerCommented:
Test email received happily.  Digging into headers to see if I can see anything.
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c32ax1Author Commented:
Need to figure out what about the anti spam setting was causing delays otherwise its great.
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