Postfix more Sources in alias_maps, which matches first?

Question

I have an entry in my Postfix configuration, as follows:

virtual_alias_maps = mysql:/etc/postfix/virtual_alias_mysql.cf,hash:/etc/postfix/virtual-aliases-map

If the same adresses are in both sources, which one will be used? First match oder last match? If you have the answer for that, please give me a reference where I could find it in the Documentation of Postfix.

Answer 1

Postfix will stop after the first map from with he it gets a result, that is, if your maps contain :

$ cat a
bob@bar.org    bob
$ cat b
bob@bar.org    bob2

and you have virtual_alias_maps = hash:a hash:b the result of the lookup for bob@bar.org will be "bob", not "bob2" nor "bob,bob2".

I can't seem to find it documented somewhere though.