[exim] verify = sender

We've been having some problems with the require verify = sender line of
our exim config with Postini's outbound SMTP servers. They're wanting a
detailed explanation of what this has exim do and I've not found a good
answer in the specifications. Does anyone have a good place to find
this?

--
Benjamin Story, CCNA CCDA
Network Administrator
Dot Foods, Inc
www.dotfoods.com
IT Helpdesk x2312 or ithelpdesk@???