https://bugs.exim.org/show_bug.cgi?id=2058
Phil Pennock <pdp@???> changed:
What |Removed |Added
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CC| |pdp@???
--- Comment #1 from Phil Pennock <pdp@???> ---
I strongly suspect that the attachments are causing Gmail's outbound servers to
try to use CHUNKING.
Please install Exim 4.89RC6 to see if that resolves the issue for you.
If you can't upgrade, then:
# Bug-fixes 4.88
chunking_advertise_hosts =
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