Lots of IP addresses of BSNL/Sancharnet.in were used by few spammers.
And many ip addresses in the same block end up being dynamic ip addresses for many DataOne Users.
End Result : Spamhaus.org has blocked many of those IP Addresses.And if your Email Service Provider uses Spamhaus.org services as an effective DNS Blacklist service to control spam, then you may not be able to send mails to many a receipients.
On top of it, its very difficult to contact DataOne Support and try to explain that their IP Address have been blocked by Spamhaus.org, etc. and convince them to contact them and resolve the issue.
They guys in Data Customer Service Center just dont understand.
Anyways, even Airtel Sucks.Never got that 128 Kbps speed they promised, the price is wonderfully high and just try to run airtel without any Anti-Virus Software and see how their networks let your PC to become a Virus Infested Heaven.
I dont understand why the hell they dont invest some millions of dollars to secure their networks, what kind of software they are using only god knows.
BroadBand is a big Joke in India.