If you use local files in
postmap(1) format, then
local_recipient_maps expects the following table format:
-
In the left-hand side, specify a bare username, an
"@domain.tld" wild-card, or specify a complete "user@domain.tld"
address.
-
You have to specify something on the right-hand side of
the table, but the value is ignored by
local_recipient_maps.
If you use lookup tables based on NIS, LDAP, MYSQL, or PGSQL,
then
local_recipient_maps does the same queries as for local files
in
postmap(1) format, and expects the same results.
With regular expression tables, Postfix only queries with the
full recipient address, and not with the bare username or the
"@domain.tld" wild-card.
NOTE: a lookup table should always return a result when the address
exists, and should always return "not found" when the address does
not exist. In particular, a zero-length result does not count as
a "not found" result.
