On Fri, Nov 19, 2021 at 10:59 AM Evgeniy Berdnikov via Exim-users <
exim-users@???> wrote:
> On Thu, Nov 18, 2021 at 11:36:53PM +0300, Odhiambo Washington via
> Exim-users wrote:
> > On Thu, Nov 18, 2021 at 12:32 PM Evgeniy Berdnikov via Exim-users <
> > exim-users@???> wrote:
> > > Yes, "References:" has 1018 octets while RFC limit is 998.
> > > This is known bug for several Outlook versions.
> > >
> > > > Not sure how to mitigate this one. Maybe I should truncate/remove the
> > > > header - and possibly break the thread?
> > >
> > > Better solution is to fold this header (split over multiple lines).
> >
> > How do I achieve that with exim-4.95? Config option??
>
> There are several variants to try:
>
> 1. Use header add/remove directives in ACLs and/or routers to "reinstall"
> problematic "References:" header if its length is too high, in hope
> Exim would fold it correctly.
> 2. Use transport filters (ch.24) on delivery stage.
> 3. Route all incoming mails through external filter (such as Amavis),
> it should reformat broken mails and re-inject them back.
>
> I use variations of N3 with custom scripts, those configuraions are
> complex and they can't be reduced to a single config option.
>
> I have no experience with N1 and N2... Just try, it's interesting
> are they working variants or not.
>
> As ultimate solution, you can check for length of "References:" header
> and remove it if length is too long. This variant should always work.
>
Does the length check look at bytes or the number of characters?
if ${length_1000:$h_References:} .... ??
--
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft.", egrep -v '^$|^.*#' :-)
