3.9 The User Database

Locates mail drops when mail is received, and maps user names to their external form when mail is sent. The format of the database file (e.g., /etc/userdb ) is:

user

:maildrop     

user@host




user

:mailname     

alias@external.domain

As a shorthand, if all users in a database should have their domain name changed when mail is sent, use:

:default:mailname       


external.domain




user1

:maildrop           

user1@host




user2

:maildrop           

user2@host

You build the database using the makemap (1) program:

% 
makemap btree 


/etc/userdb


 < 


/etc/userdb

Berkeley database ( btree class) support is required.