[TriLUG] mailman/postfix integration problem
lovelace at wayfarer.org
Thu Aug 21 11:29:23 EDT 2003
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Mike Johnson wrote:
| Christopher L Merrill [chris at webperformanceinc.com] wrote:
|>This, honestly, doesn't suprise me. I don't see how they could possibly
|>be delivered with that addressing scheme. Is there some special wildcard
|>processing that should be enabled in Postfix to allow those addresses
|>to be resolved to the "test-bounces" address that appears in the mailman
| Yes, look at this setting in main.cf:
| # ADDRESS EXTENSIONS (e.g., user+foo)
| # The recipient_delimiter parameter specifies the separator between
| # user names and address extensions (user+foo). See canonical(5),
| # local(8), relocated(5) and virtual(5) for the effects this has on
| # aliases, canonical, virtual, relocated and .forward file lookups.
| # Basically, the software tries user+foo and .forward+foo before
| # trying user and .forward.
| # recipient_delimiter = +
Note also, that while + is widely used, it isn't the same on all
systems. Qmail, for example, uses "-" as it's delimiter. That's
the main reason I've setup postfix to use "-" (since I used to
run qmail and didn't want to lose all the e-mail addresses I've
accumulated over the years).
The recipient delmiter is a very good way of tracking spam. Say,
for instance I give my e-mail address to a website. I always
add a tag on the end that identifies that website. Then, later
on if I get spam with that tag I know exactly where it came from.
I believe its even possible to get postfix to recognize both
+ and - and delimiters but you need to dig into postfix's regular
expression engine to do so. If anyone's interested in that, I'd
suggest searching the postfix mailing lists. That's where I saw
it several months ago.
Tanner Lovelace | lovelace(at)wayfarer.org | http://wtl.wayfarer.org/
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