I am using Exim but the problem has gone away now. I did notice that this server (a Leaseweb VPS, formerly Servint) was briefly on the UCEPROTECT3 about that time. I can't believe that Gmail would use that list for scoring but maybe there was a problem with a neighbor on the server that caused both the listing and the Gmail delays. I didn't see a problem with any other recipients though.
On Thu, Apr 13, 2023 at 6:32 PM Alexander Huynh via mailop < mailop@mailop.org> wrote: > Are you running exim? > > I have the following in my config, which seems to help the issue: > > # disable TCP fast open for gsmtp servers, due to a kernel bug; the > bug was supposedly > # fixed in 5.18, but it seems there's still some quirkiness with > gmail without this > # setting > # > # > https://www.chromosphere.co.uk/2022/06/01/googles-tcp-fast-open-breaks-exim-delivery/ > # > https://forum.hestiacp.com/t/gmail-smtp-timeout-after-sending-data-block-connection-timed-out/4745/75 > # > https://github.com/myvesta/vesta/commit/c7aa6ec7494bc3b7ac4885182383c1bf88692c1b > hosts_try_fastopen = !*.l.google.com : !*.googlemail.com : * > > Good luck, > -- > Alex > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop > -- =============================================== Russell Clemings <russ...@clemings.com> ===============================================
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