Viktor Dukhovni via Postfix-users:
> On Mon, Jul 14, 2025 at 01:36:00PM -0400, Wietse Venema via Postfix-users
> wrote:
>
> > > Looks very interesting. But unfortunately there's no regexp support
> > > available.
> > > And the installations of postfix and OS are quite old. Old enough, so
> > > that i
> > > seriously do not want to touch it as long as the (currently dying)
> > > hardware
> > > works.
> >
> > This could also be done with a regexp: table. This use case does
> > not require PCRE's expressiveness and speed.
>
> Indeed the RE patterns used are simple (trivial) enough to be portable
> across regexp (ARE) and PCRE syntax.
>
> > main.cf:
> > regexp = regexp:${config_directory}/
> > recipient_bcc_maps = ${regexp}rcpt-bcc.regexp
> > bcc_generic_maps = ${regexp}bcc-generic.regexp
>
> I guess, for completeness I should not have neglected:
>
> indexed = ${default_database_type}:${config_directory}/
> transport_maps = ${indexed}transport
>
> > transport:
> > bcc.invalid bcc:[other.host.example]
> >
> > master.cf:
> > bcc unix - - n - - smtp
> > -o { smtp_generic_maps = $bcc_generic_maps }
> >
> > rcpt-bcc.regexp:
> > /^"(.*)"@(.*)$/ "rcpt-bcc-${1}=${2}"@bcc.invalid
> > /^(.*)@(.*)$/ rcpt-bcc-${1}=${2}@bcc.invalid
> >
> > bcc-generic.regexp:
> > /^"rcpt-bcc-(.*)=(.*)"@bcc\.invalid$/ "${1}"@${2}
> > /^rcpt-bcc-(.*)=(.*)@bcc\.invalid$/ ${1}@${2}
> >
> > Verified with
> >
> > postmap -q -
> > 'pipemap:{regexp:rcpt-bcc.regexp,regexp:bcc-generic.regexp}'
> >
> > for quoted and unquoted localparts.
>
> Perhaps an example, like the above, that puts multiple pieces of the
> puzzle together could make a useful addition to ADDRESS_REWRITING_README?
I've been collecting 'advanced' examples. They could be located based
on affinity with existing text, or grouped in a separate docuemnt
if they touch on many features.
This example may fall in either category. With input rewriting,
transport mapping, and output rewriting it's all address rewriting.
But it is also DKIM and SPF safe, because this clever design is
unlikely to modify headers.
Wietse
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