sendmail startup extremely slow
We have a CentOS 5.2 64-bit server that is running Sendmail 8.13 with MailScanner and SpamAssasin on it. Recently it was discovered the delivery of messages was taking a longer time than expected to complete. A restart of the the sendmail server has resulted in an extremely slow startup time. As of this posting, the sm-client has been 'starting up' for about fifteen minutes.
I have checked the messages an maillog files, and there are no apparent error messages within them. What would be causing this problem to occur, and how can I correct it?