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- Spammers are becomming more and more annoying all the time. They can annoy
- you in two ways:
-
- 1) By using your mailserver as a relay to spam other people.
-
- By default, qmail doesn't allow this to happen. You decide who can use it
- as a relay by putting their IP numbers into control/relayclients or their
- host names into control/relaydomains (see "Docs/relayclients patch"). Those
- people will be allowed to send to anywhere, everybody else can only send to
- domains listed in control/rcpthosts (see "man/cat8/qmail-smtpd.0").
-
- 2) By sending you junk email.
-
- Various filters can prevent this.
- a) Using your TCP/IP stack, router or firewall to block connections from
- known spammer IP numbers.
- b) By using DNS to check that the domain of the sender exists (see
- "Docs/antispam patch"). If it doesn't, it is either from a spammer
- (most likely) or from someone whos DNS administrator hasn't set up
- DNS correctly. In either case, you won't be able to send a reply.
- c) By filtering on the envelope sender and/or envelope recipient address
- to check for known spammer addresses (see "Docs/antispam patch" and
- "man/cat8/qmail-smtpd.0).
- d) By using filters in your mail reader.
-