Lot of mails in queue

[shajay]

I am getting a lot of mail in mail queue on my Plesk 7.5 server. Most of the messages are failure delivery mails. I have to manually delete mailq using ./qmHandler –Sfailure. I assume that there is some application installed on any of the domain hosted on the server, which is sending emails regularly. Please advice me how to handle this problem.


Thanks in advance,

Regards,
SHAJI