sendmail quota + procmail

Hello, I am new on this list.

how to configure sendmail+procmail give quota per domain,
ex: i want give quota for 1 domain 100 MB, all user for
    that domain using only 100MB.

    a.com   -> 100 MB quota
    (_dot_)(_dot_)(_at_)a(_dot_)com -> only has 100 MB of quota

    b.com   -> 50 MB quota
    (_dot_)(_dot_)(_at_)b(_dot_)com   -> only has 50 MB of quota

is there document / sample procmail script?


thanks
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