Creating the postfix aliases database
Postfix uses a Sendmail-compatible aliases(5) table to redirect mail for local(8) recipients. Typically, this information is kept in two files: in a text file /etc/aliases and in an indexed file /etc/aliases.db. The command “postconf alias_maps” will tell you the exact location of the text file.
root@dell:~# postconf alias_maps
alias_maps = hash:/etc/aliases
root@dell:~#
alias_maps = hash:/etc/aliases
root@dell:~#
First, be sure to update the text file with aliases for root, postmaster and “postfix” that forward mail to a real person. Postfix has a sample aliases file /etc/postfix/aliases that you can adapt to local conditions.
/etc/aliases:
root: you
postmaster: root
root: you
postmaster: root
Note: there should be no whitespace before the “:”.
Finally, build the indexed aliases file with one of the following commands:
# newaliases
# sendmail -bi
# sendmail -bi
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