https://bugs.exim.org/show_bug.cgi?id=2806
--- Comment #4 from David Carter <dpc22@???> ---
Just to add:
This isn't a transcient problem at the yahoo.co.jp end.
That was my immediate assumption based on a collection of dropped connections
following by a single successful delivery in my logs (see below).
However this has been going on for several days, and seems to corolate well
with us deploying 4.95
2021-10-07 01:44:06 +0100 1mYHW2-0005qQ-fF
<= XXX@???
H=webmail-1a.csi.cam.ac.uk [131.111.9.32]:50358
I=[131.111.8.136]:25
P=esmtp S=1130
id=15d1196355a5bc2f25ba1a7a36973e45@???
for YYY@???
2021-10-07 01:44:12 +0100 1mYHW2-0005qQ-fF H=mx5.mail.yahoo.co.jp
[202.93.78.239]:25: Remote host closed connection in response to end of data
2021-10-07 01:44:15 +0100 1mYHW2-0005qQ-fF H=mx5.mail.yahoo.co.jp
[124.83.142.248]:25: Remote host closed connection in response to end of data
2021-10-07 01:44:16 +0100 1mYHW2-0005qQ-fF H=mx5.mail.yahoo.co.jp
[124.83.142.247]:25: Remote host closed connection in response to end of data
2021-10-07 01:44:19 +0100 1mYHW2-0005qQ-fF H=mx5.mail.yahoo.co.jp
[202.93.78.240]:25: Remote host closed connection in response to end of data
2021-10-07 01:44:20 +0100 1mYHW2-0005qQ-fF H=mx1.mail.yahoo.co.jp
[202.93.77.241]:25: Remote host closed connection in response to end of data
2021-10-07 01:44:20 +0100 1mYHW2-0005qQ-fF
== YYY@???
R=dnslookup T=smtp_dkim defer (-18)
H=mx1.mail.yahoo.co.jp [202.93.77.241]:25
I=[131.111.8.130]:44632 DT=1s: Remote host closed connection in
response to end of data
2021-10-07 01:47:48 +0100 1mYHW2-0005qQ-fF
=> YYY@???
F=<XXX@???>
P=<XXX@???>
R=dnslookup T=smtp_dkim S=1823
H=mx1.mail.yahoo.co.jp [124.83.142.124]:25
I=[131.111.8.130]:33990
C="250 ok dirdel" QT=3m41s DT=4s
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