Sendmail config: security and controlling outgoing mail
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The spam tests that I run against the server (I tried ordb.org and spamlart) say I don't have an open relay.
It wd seem that someone (using a PacBell DSL connection) created an email with my return address, and used my email server as the SMTP host, and effectively disguised an email as if it was from me.
I would like to prevent this from happening in the future. How can that be done? I would like to allow only machines from my network, by IP address, to send out mail; but allow incoming mail from anyone to accounts on my system.
The access_db option seems to control incoming mail (that is, it blocks incoming mail), or maybe that's mainly what it is for.