re: Hotmail
Two things with Hotmail and making it work.
(1) To even make it into Hotmail, you
will need a SPF record for the DNS / Domain.
If this is setup correct your email will endup in the users
Bulk Mail folder!
(2) To get the emails from your domain into the users Hotmail inbox, you
will need to contact the MSN / Hotmail postmaster with all the info asked here:
http://advertising.msn.com/adproducts/email_bulkdupe
Once the postmaster is happy, they will 'white list' your domain.
Edge.
PS. It's the same problem for Yahoo email addresses.