Pegasus Mail & Mercury

I've been dabbling with webmail off and on since something like 2003.  Captaris Webmail works fine but its discontinued and I've outgrown the 25 user license.  Also, Captaris lacks a much needed search feature. The last couple of weeks have gotten me to the point where I have SquirrelMail running on Apache with Windows 2000 Professional ...

Thanks dear Thomas R. Stephenson But how and where we can use bit of code used by SquirrelMail to do the ESMTP auth?