My gateway mail server randomly stops delivering outbound e-mails. The only
logging I find is the entry example below in the SYTEM log. The GFI products
are processing e-mails and inbound e-mails are delivered. I can resolve the
MX records for the domains if I manually do an nslookup from this box.
Sometimes they do fail, but rarely. A server reboot gets everything moving
again. Any ideas?

Event Type: Warning
Event Source: smtpsvc
Event Category: None
Event ID: 4000
Description:
Message delivery to the remote domain 'yahoo.com' failed for the following
reason: Unable to bind to the destination server in DNS.

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