It's in the suspended state because it's waiting for a mail to send. When a mail is sent, it will run, send the mail then go back to waiting for a mail to send.
When you're looking at waits and suspended processes, ignore the system processes, they usually are in a waiting state, because they're waiting for work to do. This is not a problem, if the mail process was running continually, I'd be rather worried.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability