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Event ID: 428 Source: ESE

Source
Level
Description
<process name> (<process id>) <value> The database engine is rejecting update operations due to low free disk space on the log disk.
Comments
 
Your Microsoft Exchange Server databases may become dismounted, and you may not be able to mount them again. This issue may occur if hackers use your Exchange server to relay unsolicited e-mail messages (spam). As a result, the Badmail folder fills up with messages that your server cannot handle. The messages cannot be sent back, because the return addresses are not valid (spoofed). See ME321825 for a resolution to this problem.

As per Microsoft: "Free-up disk space and then restart the Exchange System Attendant to resolve the issue". See ME555434 for more information about this event.

See MSEX2K3DB for additional information about this event.

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