Can not Receive Emails with Large Attachments Exchange 2007

We have Exchange server 2007. Recently the sending email size limit has been set to 5MB. The receiving email size is unlimited. Since then, we have issues receiving emails with large attachments (more than 5 MB). Some of the emails are received by the server (shown in message tracking), others are not. The emails received are not delivered to user mailboxes though. Specific user mailboxes are set for higher receiving email size limit (20MB), but still have the same issue.

Can someone please help with this problem?
stillsyraAsked:
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Check the transport rule if any rule in place which says any large attachment should not be allowed. Also check the Recevie connector limit. Check the below link

http://exchangepedia.com/2007/09/exchange-server-2007-setting-message-size-limits.html

Thanks
Manikandan
Will SzymkowskiSenior Solution ArchitectCommented:
As stated there are different levels where you can enable file attachment size. You need to check all possible locations to ensure that this is set properly. If the emails are getting channeled to a different Receive or Send Connector than this could be where you are getting the error messages.

See the link below for complete overview.
http://exchangepedia.com/2007/09/exchange-server-2007-setting-message-size-limits.html

Will.
stillsyraAuthor Commented:
Followed the article, but still couldn't find where was wrong:

1. Organizational limit: max. receive size: not set; max. send size (KB): 5120
2. Receive Connector Limit: all the connectors are set to 10MB (for scanning) or 50MB
3. Send Connector Limit: 50MB
4. Recipient limits: 20MB
5. Active Directory SiteLink Limit: n/a
6. Global Settings: n/a
7. Routing Group Connector Limit: n/a
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

Could you try setting the transport config using exchange management shell & see if you're able to receive large attachments

Set-TransportConfig -MaxReceiveSize 50mb

Thanks
Manikandan
stillsyraAuthor Commented:
Just checked the message tracking log, the error message for the large inbound emails failed to deliver: "550 5.2.3 RESOLVER.RST.SendSizeLimit; message too large for this sender", with source as "routing".
Will SzymkowskiSenior Solution ArchitectCommented:
stillsyraAuthor Commented:
The max send size for organization has been increased to 20 MB, and the large inbound emails have been delivered to user mailboxes.

The problem has been solved. But I still don't understand why the organization max send limit will prevent users from receiving inbound emails.
Will SzymkowskiSenior Solution ArchitectCommented:
The Organization Max Send Limits apply to all transport servers. This also applies to emails internally and external and on receive/send connectors where they are unauthenticated.

So that being said when you set a recipients mailbox higher then the organizational value this only applies to internal messages. Any messages to or from the Internet or on receive connectors where you can sendd Unauthenticated the Organizational values is applied.

Will.

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