How to have limited mail on a linux server that support unlimited e-mail account
 

dear sir
I have a linux server (red hat 7.1)
I have unlimited e-mail account for all of my domains.
How could i limit it ofr some of my domains?
please help me
my e-mail is mmh@yecc.net
bye

You'll want to look into setting up user quota's on your server.

request for sendmail configuretion
 

Hello sir/madam,

This is praveen.

I want to restrict perticular user to send/receive mails from other domains like yahoo,rediff,..etc to my domain.

Please help me.

Regards,
praveen

If you have postfix, look at
man transport
or
vi /etc/postfix/transport
on setting transport rules for specific users/domains.

Standard sendmail has similar options, but is probably more difficult to configure. Haven't tried that myself.

There are other solutions then changing the mail transport rules, like mail filtering (if you want to write a filtering script), etc.