Am 16.02.22 um 08:17 schrieb Christian Balzer via Exim-users:
On the MSAs we added IPv6 and noticed this oddity when delivering large
mails (over 128KB it seems) to google/gmail via v6:
(…)
I can confirm this and have also seen this for IPv4 this morning:
H=gmail-smtp-in.l.google.com [2a00:1450:400c:c0b::1a]: SMTP timeout
after sending data block (266346 bytes written): Connection timed out
H=gmail-smtp-in.l.google.com [142.250.147.26]: SMTP timeout after
sending data block (266133 bytes written): Connection timed out
This happens on a Debian Bullseye with Exim 4.94.2, nftables and
IPv4&IPv6. Other systems with Ubuntu 18.04, Exim 4.90_1, and IPv4 only
and iptables are not affected. As of now I have no explanation on our
side for this behavior.
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