auto creation of email IDs

Hey Guys,

I've been at this for couple of days now, and have no clue where to start,
and was almost thinking about scrapping the project, It would be great help
if anyone can give me some advice, or guide me in the right direction.

I have a portal, where users would come in and register and create an
account, as soon as an account is created, I want to be able to auto create
an email ID for them, the server would be Linux, any ideas on how this can
be done.

And also an option of creating a temporary email ID, upon creating a topic
or some kind of a post.

Could anyone guide me in the right direction or help me on this one, please
?


Thanks in Advance,
Vinay Kannan.