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You can also map all the addresses for a virtual domain to one real user, as shown here. All the mail to users with the virtual address mytrains.com will be sent to the user trainmail@turtle.mytrek.com:
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Once you have made your entries, build a virtusertable.db database file with the make command and the virtusertable option, as shown here:
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Sendmail provides you with the capability of screening out messages from specific domain, host, IP, and user addresses. Rules to perform such screening are kept in the /etc/mail/access file. You can edit this file and add your own rules. A rule consists of an address followed by an action to take. The actions supported are listed in Table 26-5. For example, to remove all messages from the myanoyingad.com domain, you would enter
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Table 26-5: Access Actions Description Accept message even if other rules would reject (exception to the rules). Discard the message completely. Reject the message, sending a rejection notice to the sender. Relay messages for specified domain. Code and message to be sent to sender.
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The next example rejects any message from larisa@turtle.mycar.com and sends a notice of the rejection:
larisa@turtle.mycar.com REJECT
You can also specify an error message to return, as shown here:
cecelia@rabbit.mytrek.com ERROR:"Retired yesterday"
To send an error message to spammers, you could include a message as shown here. The first number is an error code.
cyberspammer.com ERROR:"550 We don't accept mail from spammers"
An /etc/mail/access file with the previous entries would look like the following:
spamjunk.com larisa@turtle.mycar.com cecelia@rabbit.mytrek.com cyberspammer.com DISCARD REJECT ERROR:"Retired yesterday" ERROR:"550 Mail from spammers not accepted"
Sendmail actually reads the access rules from a database file called access.db, also located in the /etc/mail directory. To implement your rules, you have to regenerate the access.db file using the access file. You can do this with the make command using access as the argument, as shown here:
make access
Sendmail then has to be restarted to read the new access.db file.
The use of the access file is enabled in the sendmail.mc file with the access_db feature:
FEATURE('access_db')dnl
The access file will deny mail received from the listed addresses. However, you can also reject any mail sent to them. You can also reject received mail for certain hosts on your network. You do this by enabling the blacklist_recipients option in the sendmail.mc file. This option governs recipients, whereas access normally governs senders. Those addresses listed will not be able to receive any mail. This feature is also used for certain administrative users that should never receive mail such as nobody (the guest user) or ftp (the FTP user):
FEATURE('blacklist_recipients')dnl
The following example will not allow mail to be sent to cyberspammer.com (a recipient), nor can mail be received for justin@lizard.mytrek.com, secretproject@rabbit.mytrek.com, or mysurfboard.com:
mysurfboard.com ERROR:"Domain does not exist" justin@lizard.mytrek.com "Moved to Hawaii" secretproject@rabbit.mytrek.com REJECT cyberspammer.com REJECT
The Red Hat version of smb.conf configures Sendmail to user access_db. Access is granted only to users on the localhost. If your system is being used as a mail server for a network, and you have not enabled the relay_entire_domain feature, you will need to allow access by other hosts on your network. In the access file, you can place a RELAY rule for your network. The RELAY rule will let other hosts use your mail server to send messages out to other hosts. This is normally done for a gateway host that needs to relay messages from a local network out to the Internet. The following example allows access from the mytrekl.com network:
mytrek.com RELAY
For a specific host, place an entry for it in the access file as shown here:
rabbit.mytrek.com RELAY
A public list of known spammers is maintained in the Realtime Blackhole List (RBL) by the Mail Abuse Prevention System (MAPS project). Sendmail will automatically check this list for spammers if you use the rbl option:
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