=mail-mta/exim-4.88 problem with chunking

Title: =mail-mta/exim-4.88 problem with chunking
Author: Fabian Groffen <grobian@gentoo.org>
Content-Type: text/plain
Posted: 2017-03-01
Revision: 1
News-Item-Format: 1.0
Display-If-Installed: =mail-mta/exim-4.88

Exim maintainers discovered that version 4.88 has some serious problems
with its CHUNKING extension.  To quote:

  There are various known problems which can result in messages stuck in
  queues and remote servers dropping connections on larger mails.

In Gentoo, Exim 4.88 is the only stable version available, hence all
Exim users are advised to either upgrade to an unstable 4.89 release
candidate, or patch the configuration as follows:

1) in the main configuration section, add:

  chunking_advertise_hosts =

2) for each SMTP transport, add:

  hosts_try_chunking =

Please see also the announcement sent to exim-announce: