There are two things you can do: 1. You can launch sslwrap from inetd, rather than running as a daemon. This is what I do, and have never had a problem with it. However, if you have a heavy load on pop3, this might not be a great option. 2. To track down the cause of the crash, recompile sslwrap with compiler and linker debug options enabled. When sslwrap crashes, it should create a file called "core". You can use this file with gdb to see the exact point in the source code where the crash is happening.
-- Kevin