Wietse Venema:
> helices:
> > I've been through this before. Yes, I know MTA isn't preferred for such. 
> > This isn't happening elsewhere.
> > 
> > We have 100s of domains. For example, To:i...@domain1.com will get 
> > delivered to s...@2domain.net.

This can be done with virtual_alias_maps (i...@domain1.com->s...@2domain.net).

Important: this replaces the envelope address but not the header address.

> >  When Suzy replies, it will be 
> > From:i...@domain1.com
> > 
> > I can do this by rewriting both From: and To: headers, both incoming and 
> > outgoing.

Use canonical maps:

    canonical_classes = header_sender, header_recipient
    canonical_maps = some-map-type:some-map-name

Where the canonical_maps does

    i...@domain1.com -> s...@2domain.net (or some other).

So that the mail will appear to come from s...@2domain.net (otr whatever).

Important: this replaces header addresses only.

        Wietse

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