how to allow guest users to sign up for email address.

Can be done via an api scripts. But I would advise against doing it this way, unless you want your servers ip on the RBL blacklists soon.

If you want friends to use your domain for mail, it's better to create some accounts for them and pass the login credentials to them.
 
Can be done via an api scripts. But I would advise against doing it this way, unless you want your servers ip on the RBL blacklists soon.

If you want friends to use your domain for mail, it's better to create some accounts for them and pass the login credentials to them.
can i have i link to this script or any guide?

There will be some more request to get the link for sign up. There will be 100 max 150 accounts.
 
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