On 01/06/22, Jeremy Harris via Exim-users ([email protected]) wrote:
> On 01/06/2022 12:05, Rory Campbell-Lange via Exim-users wrote:
> 
> Possibly another case of
> https://lists.exim.org/lurker/message/20220429.095648.83dbd9f7.en.html
> 
> - for which the workaround was
>        hosts_try_fastopen = !*.l.google.com

On 01/06/22, Graeme Coates via Exim-users ([email protected]) wrote:
> On 2022-06-01 11:05, Rory Campbell-Lange wrote: 
...
> Yes - See:
> https://lists.exim.org/lurker/message/20220524.110745.56bc2aa8.en.html
...
> In /etc/exim4/conf.d/transport/30_exim4-config_remote_smtp (Debian system):
> 
> hosts_try_fastopen = !*.l.google.com

Thanks very much indeed for these helpful replies.

As our servers are only outbound we are using exim4-daemon-light and the simple
config (i.e. update-exim4.conf.conf has the option dc_use_split_config='false').

I added the hosts_try_fastopen config line here:

    ### transport/30_exim4-config_remote_smtp
    #################################
    ...

    remote_smtp:
      debug_print = "T: remote_smtp for $local_part@$domain"
      driver = smtp
      hosts_try_fastopen = !*.l.google.com


Adding that option cleared the queue.

Thanks again,
Rory

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