Event ID - 9045

Event Id9045
SourceMSExchangeMTA
DescriptionAn unexpected error has occurred which may cause the MTA to terminate. Error: Access violation (0xc0000005) at Address 0x43418e reading from 0x4. [BASE GATEWAY 36] (16)
Event InformationAs per Microsoft:
CAUSE
This problem may occur if your Exchange server tries to process an e-mail message in a scenario where both of the following conditions are true:
The Exchange MTA must process a long string of alternate recipients for the e-mail message.
The final alternate recipient for the e-mail message is a custom recipient. To send the message to the custom recipient, Exchange transports the message through the Microsoft Exchange Internet Mail Service.
For example, this problem may occur in a scenario that is similar to the following:
1. You send an e-mail message to User1.
2. User1 keeps a copy of the e-mail message and has User2 specified as an alternate recipient.
3. User2 keeps a copy of the e-mail message and has User3 specified as an alternate recipient.
4. User3 keeps a copy of the e-mail message and has User4 specified as an alternate recipient.
5. User4 keeps a copy of the e-mail message and has User5 specified as an alternate recipient.
6. User5 keeps a copy of the e-mail message and has User6@domain_name.com specified as an alternate recipient.
In this scenario, the MTA may quit unexpectedly when it tries to process the large address buffer.
RESOLUTION
Hotfix information A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.
Reference Linksevent ID 9045 are logged to the application event log after the MTA quits unexpectedly in Exchange Server 5.5

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