Assume mydomain.com as the new domain name. If the mail server that
serves the new domain name has a full-time connection to the Internet,
include the following line in the db.domain file (domain is the domain name specified in the file
/etc/resolve.conf):
mydomain.com. IN MX 10 mymailserver.mydomain.com. |
Otherwise, you must have another machine to queue mail for
your domain. Include the following lines in the db.domain file:
mydomain.com. IN MX 10 mymailserver.mydomain.com. |
mydomain.com. IN MX 20 othermailserver.otherdomain.com. |
Now you must set up Sendmail.
Generate the sendmail.cf.gen file using the gen_cf utility with the virtusertable option, and move this file to /etc/mail/sendmail.cf.
For more information on gen_cf, read the section “Modifying
the Default Sendmail Configuration File”.
Create the virtual user table
in the /etc/mail directory. A sample virtual user table may look
like the following:
joe@mydomain.com jschmoe
jane@mydomain.com jdoe@othercompany.com
@mydomain.com jschmoe |
In this example, the address joe@mydomain.com is mapped to the local user jschmoe, jane@mydomain.com to the remote user jdoe@othercompany.com, and any other address in mydomain.com is mapped to jschmoe.
Build the virtual user table
database file by running the makemap utility on the command line as follows:
# makemap dbm /etc/mail/virtusertable < /etc/mail/virtusertable |
To reverse map local users for outbound mails, you must generate the sendmail.cf file with the genericstable option in addition to the virtusertable option.
You must generate the generics table similar to the virtual user table,
but with the entries reversed.
Example:
jschmoe joe@yourdomain.com |
Add your domain name to the
/etc/mail/sendmail.cw file.
Kill and restart Sendmail.
You can now receive mail at mydomain.com.
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 | IMPORTANT: The virtual hosting feature provides better
support for ISPs that offer queuing services to dial-up customers because
queue-runs no longer wait for the dial-up server connection attempts
to time out. |
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