Bug#962847: exim4: takes forever to send a mail after sleeping

[Adam D. Barratt]

On Mon, 2020-06-15 at 18:01 +0200, Marc Haber wrote:
> On Mon, Jun 15, 2020 at 01:56:18PM +0200, Rémi Letot wrote:
> > My mail client and exim are both running on my laptop, and the
> > provided logs are from that same laptop.
> > 
> > The fault is the delay between exim accepting the message, and
> > actually delivering it to the smarthost. During that delay, my mail
> > client is stuck too.
> 
> That is highly implausible. In a normal setup, the SMTP client is out
> of the game as soon exim has locally queued the message. Can you run
> tcpdump on lo to find out what's happening? I guess that you're
> putting the laptop to sleep before the (local) TCP session has been
> properly closed, making it subject to the exponential backoff
> algorithm and eventually a session timeout. There is not much exim
> can do in this situation.

I'm wondering if this is an issue related to the clock changing (or not
changing when it should) as a result of the suspend / resume cycle,
similar to 
https://lists.exim.org/lurker/message/20200619.090409.faf4b641.en.html

Regards,

Adam