On Wed, Jan 30, 2019 at 05:18:19PM -0800, Jeremiah Rothschild wrote:
> Recently I rolled out a transition from sendmail to postfix. I've been very
> happy with the changes except for one feature, which was supported by
> sendmail but I'm not sure what to do about it in postfix.
>
> This is the use of a backslash before a username in the aliases file. A
> backslash inhibits further alias expanding. I have found it useful in
> certain cases to stop mail loops.
>
> Is there an equivalent feature supported by postfix?
IIRC Postfix will automatically do loop elimination, provided that
$myorigin is one of the domains listed in $mydestination.
However, with Postfix you're far better off implementing the vast
majority of address -> address mappings as virtual aliases, which
work much more efficiently, and definitely have loop elimination.
virtual:
u...@example.com u...@example.com, otheru...@example.net
Use local aliases(5) *only* when they offer something that virtual(5)
aliases do not. That is, special non-rfc822 recipients, such as:
foo-owner: foo-request
foo: :include:/some-list
bar: /some/file/nobody/owns
baz: "|some-pipe nobody runs"
--
Viktor.
