From: Dan Farrell (danspore.ath.cx)
Date: Sun Apr 13 2008 - 13:20:44 CDT

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On Sun, 13 Apr 2008 14:55:07 +0530
"punit jain" <contactpunitjaingmail.com> wrote:

> Hi Sandy,
>
> Perhaps the directive is smtpd_sender_restrictions which should look
> only for MAIL FROM . This means only mails originating from domains
> listed in sender_domain_allowed should be able to send mail. How it
> got to do with rejecting mails from all other domains is not
> understood by me . Would appreciate if you could explain me.

from http://www.postfix.org/postconf.5.html:
===========================================================
smtpd_sender_restrictions (default: empty)

    Optional restrictions that the Postfix SMTP server applies in the
context of the MAIL FROM command.

    The default is to permit everything.

    Specify a list of restrictions, separated by commas and/or
whitespace. Continue long lines by starting the next line with
whitespace. Restrictions are applied in the order as specified; the
first restriction that matches wins.

    The following restrictions are specific to the sender address
received with the MAIL FROM command.

check_sender_access type:table
        Search the specified access(5) database for the MAIL FROM
        address, domain, parent domains, or localpart, and execute the
        corresponding action.
[...]
Examples:

    smtpd_sender_restrictions = reject_unknown_sender_domain,
        check_sender_access hash:/etc/postfix/access

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