On 2024-03-02 at 04:45:53 UTC-0500 (Sat, 2 Mar 2024 10:45:53 +0100)
Gerben Wierda via Postfix-users <gerben.wie...@rna.nl>
is rumored to have said:
Aliases are nice, to receive mail. But when you reply, the address
behind the alias is exposed.
To prevent that I need to create full mailboxes, which requires a lot
of administration in dovecot, postfix.
Suppose
- I am m...@mydomain.tld
- At evilcompany.com they know be by my alias
meatevilcomp...@mydomain.tld
- I am mailing with marketingt...@evilcompany.com
Is there a way to create a lightweight 'reverse alias' for a specific
target. E.g., suppose my alias is
meatevilcompany: me
then have a mail from m...@mydomain.tld to marketingt...@evilcompany.com
turn into a reply from meatevilcomp...@mydomain.tld to
marketingt...@evilcompany.com, but only for
marketingt...@evilcompany.com or for @evilcompany.com?
There is a commonly-used header that supports MUAs handling this:
X-Original-To
Postfix will add that to mail it is delivering locally by default. It
also adds a Delivered-To header with the final result of aliasing.
Some MUAs (I think this included TBird but I have not used it regularly
in many years) can be configured to recognize those and compose replies
as being "From: " the X-Original-To address, using the Delivered-To to
figure out what account the reply should use for determining outbound
server & auth.
This seems like it is much more suited to the MUA rather than a MTA/MSA.
I don't think I want something on the server responsible for rewriting
headers to keep their original content confidential when the user's MUA
could have just written the proper public address there in the first
place. I've been working with mailing lists this way for years on
Eudora, Mulberry, TBird, and now MailMate. I reply to a message with an
X-Original-To header and the MUA uses that address to compose and send
the message.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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