Re: [exim] First SMTP callback implementation

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Author: Tony Finch
Date:  
To: exim-users
Subject: Re: [exim] First SMTP callback implementation
On Mon, 7 Mar 2005, Philip Hazel wrote:
> On Sun, 6 Mar 2005, Marc MERLIN wrote:
>
> > I've always assumed that SMTP callbacks (yeah, they're callouts now, sorry
> > :) came from Philip in Exim.
> >
> > Is this correct?
>
> I don't know. Callbacks were introduced in Exim 3.20 in November 2000;
> callforwards did not arrive till Exim 4, just over a year later.
> (Strictly, callbacks were "released" in a testing release called 3.168.
> I don't have details of its release date. 3.16 was released in Auguest
> 2000, so it was sometime between August and November, if it matters that
> much.)
>
> You'll need to search for any evidence of anyone else doing this any
> earlier.


AFAIK the only other major MTA that does it is Postfix, and it introduced
it in version 2.1 last year (though it was available in the June 2003
snapshot). Posfix didn't even reject invalid local recipients until 2002.

Tony.
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