I know that maybe doing the right tweaks to my MX entries on my whm i can acomplish the following:

1. I have a reseller account and I want to offer unlimited space on their email accounts.
2. I don't want to use my web hosting space for those messages.
3. I want to make it seamless for my customers that they have their emails hosted at someaccount@gmail.com and they give to their customers myemail@mydomain.com.

It's that Possible?

No,

That is not possible, and if it was, it would probably also violate Google's rules.

What you could do is put a forwarder on myemail@mydomain.com to someaccount@gmail.com, but the user would still have to read the e-mails in google and send the e-mails from his google-account.

I guess if you could write a script that uses IMAP to retrieve the messages from Gmail and put it in the users account, you could mimic a part of the behavior you are trying to achieve.

But, in general, I consider this as very very bad practice. If I was a customer, I would certainly want to know here this "unlimited" space is coming from, and if I knew you were faking it, I would never ever sign up.

you can use google apps (gmail) or domains live (hotmail) to host you customer domain.

take a look at:

http://www.google.com/apps/

or

http://domains.live.com/

you may also setup your gmail account to pull from your regular email for backups using imap / pop3

Thank you winger you had the answer it was:
http://domains.live.com/ it's free and it doesn't violate anybodys policy and it works with my domain thanks so much for your insight.

Thank you winger you had the answer it was:
http://domains.live.com/ it's free and it doesn't violate anybodys policy and it works with my domain thanks so much for your insight.

I am glad that this helps you

you may also take a look at http://www.gowindowslive.com/hotmailplus/en-us/default.aspx for who needs more then the free service.