I am having Sendmail ver 8.13.1 installed on CentOS 4.5. Recently we have noticed that some emails are not getting delivered to user. Mailserver is receiving emails and they are getting processed but not getting delivered to user.

I have checked mail log and in the log it shows that email has been delivered to user. In actual scenario mail is not delivered

If any one has solution please let me know.

Thanks in Advance