User can't receive emails with attachments (not even 500kb zips)

None of our users are currently receiving emails with attachments.
- I checked the Mailbox limits in the storage group (all set to no limit)
- the virtual SMTP has also no limits
- Message Delivery in "Global Settings" has no limits

Some of the senders get the attached error message back. Some don't get anything back.
The message doesn't appear in any inbox or in the "local delivery queue" (froze it to see if anything goes through)

Send messages with 2MB attachments and also 500kb....

Are there any other settings I can check?
Your message did not reach some or all of the intended recipients.
 
      Subject:   Testmail
The following recipient(s) cannot be reached:
 
      user@domain.co.uk on 15/11/2007 17:47
 
            This message is larger than the current system limit or the recipient's mailbox is full.  Create a shorter message body or remove attachments and try sending it again.
            <domain.co.uk #5.2.3>

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ivickerAsked:
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Vishal BreedConnect With a Mentor Program ManagerCommented:
The best way to handle DS2MB is try configuring some seetings - check whether it works?

If it does not work - only option left is reinstalltion!!!
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Vishal BreedProgram ManagerCommented:
So far you have checked 3 settings;
- Mailbox limits in the storage group (all set to no limit)
- the virtual SMTP has also no limits
- Message Delivery in "Global Settings" has no limits

1> What about SMTP connector ??
2> Are you sendin this emails internally ??
3> even if these are external email; does it show your server name in NDR (as you have typed domain.co.uk.
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ivickerAuthor Commented:
The SMPT connector is fine as well.
The Emails have been sent externally.
I typed domain.co.uk as this is the server name (It is hosted in a hosting centre)
I should mention if we have a second server (in another hosting centre), both connected via VPN in the same domain and exchange administrative group. This second server is working fine!
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Vishal BreedProgram ManagerCommented:
Any recipient policy ?? Which can set mailbox limit ??

Check it in Message Tracking from where it is blocking.
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ivickerAuthor Commented:
No recipient policy except the default one. No limits set in the default one.

Checked Message Tracking, but didn't come up with anything.
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ivickerAuthor Commented:
Update:
I sent an internal test with about 5MB and it went straight trough!
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Vishal BreedProgram ManagerCommented:
Good!! So Internally it is working fine. Now I need moe clarification.

* Server A (Facing Problem)
* Server B (working fine)
* You have mentioned internally it is working fine.
 
1> Can A & B users send emais with Attachments ??
2> When you telnet Server A on Port 25 & type EHLO - do u get following (exact) output ??

250-my.server.name Hello [1.1.1.1]
250-TURN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250-X-EXPS GSSAPI NTLM LOGIN
250-X-EXPS=LOGIN
250-AUTH GSSAPI NTLM LOGIN
250-AUTH=LOGIN
250-X-LINK2STATE
250-XEXCH50
250 OK
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ivickerAuthor Commented:
1> they can send emails with attachments. no problem at all
2> the output is exactly the same
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Vishal BreedProgram ManagerCommented:
In the error code (in NDR email) does it shows Server Name of A or B ??

Also please select from following
1> Internet Incoming email with attach. do not deliver to Server A
2> Internet Outgoing email with attach. do not go out from Server A

Because if it is 1>; you need to check
- Mailbox limits in the storage group
- The virtual SMTP limits
- Message Delivery in "Global Settings"
- AD properties of that user mentioning mailbox size & allowed attach. size & check the mailbox size

If it is 2>; you need to check
- Mailbox limits in the storage group
- The virtual SMTP limits
- Message Delivery in "Global Settings"
- AD properties of that user
- SMTP connector
- AD properties of that user mentioning mailbox size & allowed attach. size & check the mailbox size
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ivickerAuthor Commented:
1> Internet Incoming email with attach. do not deliver to Server A

- Mailbox limits in storage group are fine (no limit)
- virtual smtp is set to no limits
- "Message Delivery" is set to no limits
- AD properties are fine as well.
- User mailbox size is 250MB...

Its really strage, even if it would have the defaults set somewhere 250MB mailbox and 250kb message size is far away from the default settings...
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Vishal BreedProgram ManagerCommented:
* Have you ever changed these settings of Mail Limits ??

* When we change such settings SMTP related settings which resides in AD; AD treis to update IIS metabase for same.

* If such SMTP settings are changed; you must restart SMTP & Routing engine service.

* If you have done this - then problme is with DS2MB (Directory Service 2 Metabase Update); which can be resolved by reinstallation.

* For this kindly check whether DS2MB is working fine. Read this carefully http://msexchangeteam.com/archive/2004/10/14/242310.aspx
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ivickerAuthor Commented:
- I have changed these settings to limit and then back to no limit
- SMTP and Routing have been restarted after the changes
- DS2MB has also been reinstalled

Sorry :(
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