Mike Cardwell:
> * on the Fri, Sep 26, 2014 at 12:13:24PM +0200, li...@rhsoft.net wrote:
>
> >> I have some Exim configuration which allows me to have automatically
> >> expiring email addresses. It accepts mail for any addresses matching
> >> the format:
> >>
> >> yyyy-mm...@tmp.grepular.com
> >>
> >> But only if the YYYY-MM-DD matches a date which is today or in the
> >> future. For example, "2014-09...@tmp.grepular.com" will accept mail
> >> up until the end of this month and will reject mail from that point
> >> onwards.
> >>
> >> What would be the best way of replicating this functionality in
> >> Postfix? If it would involve calling out to an external script, I am ok
> >> with writing such a thing, but if it can be done "natively" inside
> >> Postfix, that would be preferable.
> >
> > this maybe best suited with mysql tables because you
> > could have a catch-all on the MDA/LMTP and "show" postfix
> > the needed RCPT table based on query
>
> That's an interesting idea. Thanks for the suggestion. I'd prefer not
> to introduce an additional service though if I don't have to. I'm
> currently using flat files rather than MySQL.
>
> I've added Amavis to the mix for SpamAssassin filtering and I'm
> starting to think that might be a good place to do this if I can't do
> it directly inside Postfix.
With Postfix, valid recipient addresses are specified in lookup
tables.
Your request would require a lookup table that somehow maps a dynamic
address to a fixed one.
What about the following design:
1) A lookup table that is specified entirely inside main.cf:
inline:{name=value, name=value, ...}
2) Pseudo parameters that expand to year, month, and so on:
$yy expands to 2014
$mm expands to 09
These are sufficient to support an email address that is valid for
one month:
virtual_alias_maps = ...,
inline:{joe$yy$m...@example.com=real...@example.com}, ...
Mail for joe201...@example.com will then be delivered to
real...@example.com, but only in the month of September.
In October, this would accept mail for joe201...@exampole.com.
Wietse
