Bug#925982: pretty useless without local_scan

[Andreas Metzler]

On 2019-04-03 Adam Borowski <kilobyte at angband.pl> wrote:
> Control: severity -1 important

> (Justification: exim is nearly completely useless for receiving mails for
> an Internet domain -- there's ~100 spams per day per address.)

> I've wasted time concurrently coming up with Andreas' findings -- and
> indeed, rebuilding with HAVE_LOCAL_SCAN=yes makes spam filtering work again.

Hello,

I am yet undecided whether it is better to hotfix this bug or do the
right thing and drop the dynamic local_scan patch and adding a
Breaks: sa-exim

sa-exim is dead upstream since 2006 and seems to be really broken
now. See 
https://lists.exim.org/lurker/message/20180726.113354.6d03efde.en.html
and #879687

cu Andreas

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