When using FEATURE(virtusertable), sendmail will do translation based on the entire domain name when the address is first read. This is similar, but not identical, to aliasing. It is commonly used to host multiple domains with different (and possibly even overlapping) users on one machine using MX records. The format of the input file (e.g., /etc/virtusertable) is:
For example, an input file might read:
email@example.com foo-info firstname.lastname@example.org bar-info email@example.com jdoe firstname.lastname@example.org email@example.com @bar.com mary
The first two entries translate firstname.lastname@example.org and email@example.com into different names, which may be user names or aliases. The third and fourth entries alias users to other names. The fifth entry says that firstname.lastname@example.org that wasn't otherwise recognized should go to mary.
You build the database from the input file using the makemap(1) program:
You declare the database for use with your .mc file, like this: