Stopping Spam with Sendmail
Many people have problems with spam. The simplest way to
avoid it is to never give out your e-mail address to anyone :( or build an access DB.
This will only work with people who use sendmail as their incoming mail server, not mail obtained over
a POP3 connection (although this will work with clients such as fetchmail)
Here is a guide to setting up an access DB to stomp spam.
1.) Create the database file.
I suggest creating the file /etc/mail/access or editing this file if it is already there.
2.) Block hosts, address or domains
In this file you need to place the following to
block:
a) domains
domain.com DENY
b) Hosts
host.domain.com DENY
c) Email address's
user@domain.com DENY
An example access file may look like this:-
spammer.com DENY
spammer2.com DENY
mail-x.spammers.com DENY
relay.spammers.com DENY
jbloggs@spam.com DENY
jbloggs2@spam.com DENY
The next step is to tell sendmail to rebuild the access database. The command for this is, as root,
makemap hash access < /etc/mail/access
This will rebuild the access database.
Address's matching this rules will get a message back similar to:
550 - Access Denied...
You have now learned one method of eradicating
spam.
-- Sparc
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