User able to send out email as though of another person

You can't. Unless you change the email RFCs.

The "From:" header in email is part of the body. MTAs (Mail Transport Agents) don't care about what' sin the body, shouldn't care what's in the body, and according to the RFCs, shouldn't be able to change the body.

If you follow the anti-spam community you've probably read somewhere that the entire email specification needs to be changed. Start here.

Jeff
 
as far as i am concerned. the least is the login should correspond with the email address registered. anyway i can do that.
 
Sure. Write your own email system that doesn't follow RFCs. Two things will probably happen.

First your clients who want to be able to change their outgoing email address will leave you for other vendors (we do it all the time; we use forwarders in return addresses so when we get email, we know if an address we gave [for example] to a vendor, has been sold to spammers.

Second, you'll soon get on block lists for simply being non-RFC compliant.

Or you can write a new RFC. Technically you should be able to do that; after all the letters RFC simply stand for Request for Comments. But over the years they've become the specification glue that hold the Internet together. So the first thing you'll need to do is spend years gaining credibility in the Internet community. And you won't get that if you want to change RFCs in a way that take away what most of the community considers an unalianable right.

Jeff
 
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