How to separate different domains on an e-mail database

[Carlos Fernando Scheidecker Antunes]

Hello all,

I've got an e-mail database of our subscribers and I would like to have a
SQL statement do select DISTINCT domains.

Meaning, I want to know all domains. I whish I could query it so that it
would show me just once each domain, or everything that is after the @ sign.

Does anyone knows how to query it?

The e-mail field has 50 chars long. Each user (whatever is before the @) has
a different lenght off course. So I need to list just once each domain.

Any ideas or suggestions?

Thank you in advance,

C.F.