We have an Exchange 2007 SP1 running with mailbox/clientaccess/hub on one server. A lot of emails everyday (seems randomly) from external senders do not get delivered to recipients. There is no edge role and no spam/antivirus in place as we have an externaly antispam mail filter gateway. Emails come through the gateway as clean, get delivered to the exchange server but then fails when delivering it mailbox. So users are not even aware what messages are being missing. Server logs do not show any errors, but these can be picked up from the message tracking results. The eventID of the messages are FAIL and the Source is STOREDRIVER and the recipient status is:
550 5.2.0 STOREDRV.Deliver: The Microsoft Exchange Information Store service reported an error. The following information should help identify the cause of this error: "MapiExceptionNoAccess:16.18969:84010000, 17.27161:0000000098000000000000000000000000000000, 255.23226:00000000, 255.27962:7A000000, 255.27962:56000000, 255.17082:05000780, 0.16993:80030400, 4.21921:05000780, 255.27962:FA000000, 255.1494:00000000, 255.26426:56000000, 4.6363:0F010480, 6.21970:0F0104800201F3670F010480, 4.6363:0F010480, 2.31229:00000000, 4.1091:05000780, 4.4603:05000780, 4.5323:05000780, 255.1750:2F400000, 0.26849:05000780, 255.21817:05000780, 0.24529:00000000, 4.18385:05000780".
The exchange 2007 was a migration from Exchange 2003.
Can someone advise what the problem is.