MailScanner and Licensing

[am.lists]

I am a value-added hosting provider. That is, I host domains, develop
websites, and manage mail for my clients.

I've recently come to know the love of MailScanner (with it's usual
set of accessories), and have began migrating away from the commercial
products we had been using.

My question is now what, if anything, am I obligated to do, change,
disclose, etc. to stay in line with the spirit and intent of using the
software in this way?

Angelo