Unable to Recieve Emails from a Few Clients

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?

Just the built in anti spam tools in Exchange

Ah - not good!

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

Do they come through now?

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

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

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?

You can change the Exchange Anti-Spam settings to whitelist them by IP in the IP Allow List.

I received the DNR from one of the clients mind if I shoot it your way ?

I'm not sure what which IP to allow

Sure - feel free.

No probs - I'll have a look and let you know.

Sent The title is "Lunch Order for March 22nd"

had the same client shoot you an email titled "test email"

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.

Test email received happily.  Digging into headers to see if I can see anything.

Need to figure out what about the anti spam setting was causing delays otherwise its great.