This is a simple mail server configuration. The machine is threering.clowns.org, but it is the mail server for clowns.org. In addition, is acts as a mail server for three domains and allows relay for a domain that people use for POP access.

Send output to stdout

Set the version number for the .cf file

Set the operating system type and cause it to read ../ostype/linux.m4.

OSTYPE(`linux')

Set the domain to generic and cause it to read ../domain/generic.m4. This sets the redirect, forward_path and use_cw_file options (typically).

DOMAIN(`generic')

Use the DNS Realtime Blackhole antispam list.

FEATURE(dnsbl)

Use the virtual user table for defining virtual mail domains.

FEATURE(`virtusertable',`/etc/mail/virtusertable');

Use the generics table for mapping outgoing domain addresses.

FEATURE(`genericstable',`/etc/mail/genericstable');

Give the name of the file to hold the generic domains to be translated by sendmail. The alternative is to use the GENERICS_DOMAIN(name) macro in this file to define each domain.

GENERICS_DOMAIN_FILE(`/etc/mail/sendmail.cw');

Masquerade as the primary name server for this domain.

MASQUERADE_AS(`clowns.org')

Masquerade envelopes as well as headers

FEATURE(masquerade_envelope)

Which mailers are allowed to send send/receive mail.

MAILER(local) MAILER(smtp)

This file contains the incoming mail domains that need to be relayed to locally hosted domains.

bigtop.org
retired-clowns.org
circus.com
bigisp.com

This file contains the local mail domains that are hosted by this host. to locally hosted domains.

bigtop.org
retired-clowns.org
circus.com

This file contains the local users that need to be rewritten when sent. Only this file controls the rewriting of both domain names and user names.

oldbozo bozo@retired-clowns.org
ptbarnum  owner@circus.com
bailey  bossman@bigtop.com
patriciap tickets@bigtop.com

This file controls the conversion of incoming addresses to local users. Also, it allows the opportunity to handle some multiplexing of addresses and to handle address changes in a more friendly manner.

@retired-clowns.org       oldbozo
owner@circus.com          ptsecretary
bossman@bigtop.com        baileysecretary
tickets@bigtop.com        patriciap
clownapp@clowns.org       bozo
selzerwater@clowns.org    winkydinky@bigtop.com
bignose@clowns.org        error:User has moved

The aliases file can be used to set up mailing lists and to perform some of the functions that are performed by the virtusertable.

help: sweetieface
webmaster: admin,ringmaster
clowns-list: :include:/usr/local/lists/allclowns
stooges: larry,moe,curly

The access file is used to limit access to the sendmail capabilities. In this case, there are some domains that we don't want to accept mail from as well as some specific users.

publishersclearinghouse.com   DISCARD
bigbird@sesamestreet.com      REJECT
bigtop.org                    RELAY
retired-clowns.org            RELAY
circus.com                    RELAY
bigisp.com                    RELAY