Gerben Wierda via Postfix-users:
> 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 [email protected]
> - At evilcompany.com they know be by my alias [email protected]
> - I am mailing with [email protected]
> 
> 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 [email protected] to [email protected] turn 
> into a reply from [email protected] to 
> [email protected], but only for [email protected] or 
> for @evilcompany.com?

This sounds like a job for one of:

- A "real" DBMS with a custom queries for forward and reverse
  aliases/canonical mappings.

- Custom automation that generates Postfix indexed files with forward
  and reverse aliases/canonical mappings.

- A smart mail client with custom rules.

        Wietse
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