From: Wietse Venema (wietseporcupine.org)
Date: Wed Sep 24 2003 - 18:19:33 CDT

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Dean Gibson (Mail Administrator):
> I was going to ask the following question here:
>
> Can I insert a new variable in main.cf; eg:
>
> LOOKUP_DIRECTORY = /etc/postfix/lookup
>
> and then use
>
> alias_maps = hash:$LOOKUP_DIRECTORY/aliases
>
> However, I just tried it and it appears to work (in Postfix 1.1.13). So,
> my question is now, is this feature "supported" (in the sense that it
> should work in future versions of Postfix)?
>
> One possible future enhancement to Postfix that would kill this, is
> validating variable names (to detect spelling errors).

It works as intended, and has been used extensively for doing
backwards compatibility hacks, but I can't promise that Postfix
won't ever become smarter so that it can figure out that some name
might be a typo.

For example, some non-existent variable names are defined by the
restriction_classes parameter, but a smart main.cf processor could
recognize that these non-existent variable names are OK.

        Wietse

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