Bug#954192: exim4-config: prdr_enable = true breaks exim4+dkimproxy when using multiple recipients

[Marc Haber]

On Thu, Mar 19, 2020 at 02:41:34PM -0400, noc at nobaq.net wrote:
> On 2020-03-19 08:44, Marc Haber wrote:
> > On Wed, Mar 18, 2020 at 06:32:05AM +0100, Niki Hammler wrote:
> >> This worked flawlessly until jessie (for me, from 2008 until now). However, with prdr_enable = true, exim4 hangs when looping back the message when
> >> using multiple recipients. It hangs with message:
> >>
> >>   353 PRDR content analysis beginning
> > 
> > That happens when dkimproxy re-delivers the message back to exim? What's
> > the SMTP dialog before? Does exim advertise PRDR? Does the client
> > request it?
> 
> Yes, it happens when dkimproxy redelivers it.
> However, as I understand dkimproxy, don't think of it as a full-fledged
> SMTP server. Once I connect to dkimproxy, it transparently opens back a
> connection to exim. So the greeting message comes actually from exim:

I see. So we have an prdr-enabled exim talking to a prdr-enabled exim
via a proxy that chokes on prdr. I'd say that's the proxy's fault and
issues like that are bound to re-happen with any other extension that
interferes with the SMPT dialog.

> I tried
> 
> prdr_enable = ${if eq{$received_port}{10029} {false}{true}}
> 
> but I get the error
> 
> Mär 19 19:32:06 mail exim4[10887]:   "" is not a valid value for the
> "prdr_enable" option

You can try running with debugging to see whether expansion happens and
how.

Greetings
Marc

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