event 7002 ’421′ service temp unavail

10 pts.
Tags:
Event ID
Event ID 7002
Exchange 2003
hi we have been having erratic outbound behavior for 2 days no system errors just numerous 7002 smtp. we tested switch port, internet connect, no viruses, has some one experienced this? several outbound remain as 'retry' but others go thru normally????

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Someone could be trying to use your mail server for spam purposes. Do you allow relaying on your server. Check to see if you have an open relay

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