so this is the start of this new module. as you all agreed before this is one of most needed modules for drupal. so i've started developing it for drupal 5.x and 4.7.x .
these days i'm so busy developing some other custom modules for one of our customers.
so i'll do this module in my spare time and i'll share it with you all.
i've checked those open source codes with gmail and yahoo and it seems to work great. but regarding other service providers im not so sure. so for the initial phase i'll only do this gmail and yahoo.