we have sendmail installed as E-mail server on Red Hat Linux. The problem is that from few days the users are getting duplicate mails i.e. same mails twice or thrice in the outlook Express.
The Load on the Sendmail Server is 5.8

Can any one suggest a solution for this probelm
thanx in advance !

Can you retrace changes made in configuration files wrt delivery?

I haven't made any changes to the sendmail configuration file ! ! !

I didn't say you did, maybe someone else did. Also, local delivery is also a MDA thing (say procmail) so you also would need to check /etc/procmail.*{conf,rc}, Procmail include directory recipes, personal ~/.forwards and Procmail logs if it is set to log verbose (else make it log verbose), any anti-spam and anti-virus tools too. Also check if there was anything changed or upgraded since this behaviour started. And also have a user save a message and its duplicate (all with full headers) and check for differences. Does this problem occur for all users? Has anyone tried a different mail client? If none of this turns up changes then we could run a copy of Sendmail in debug mode, but that's a last resort option.