https://bugs.exim.org/show_bug.cgi?id=2665
--- Comment #23 from Jeremy Harris <jgh146exb@???> ---
Looks like you have a networking problem - nothing after the 192'nd byte of
the TCP connection is being ack'd at the TCP level. We see the SMTP data
go-ahead,
and the next packet being sent by the kernel (the first one of the SMTP data)
is
2774 bytes. That could get fragmented down to the interface MTU by the NIC, if
you have offload enabled (likely) - we're not seeing the actual wire-size
packets
here. In any case, the far end isn't ack'ing.
Summary: probable MTU issue on the net, compounded by ICMP being disabled.
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