Check this url: http://chennai.vsnl.com/setup/win95/linux/index.html that contains vsnl's guide to connecting to their service through linux based machines. they have help on ppp, fetchmail and kppp.

Funny thing though. the linux directory is under the win95 directory.

Philip

PS: I'm writing this mail by telnetting to port 25 on smtp.vsnl.net