Re: [exim] SMTP errors with google

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Author: Jeremy Harris
Date:  
To: exim-users
Subject: Re: [exim] SMTP errors with google
On 01/06/2022 12:05, Rory Campbell-Lange via Exim-users wrote:
>      Exim version 4.94.2 #2 built 13-Jul-2021 16:04:57

>
> The error seems unique to sending to google; we are sending around 12.5k messages/day to a wide variety of recipients.
>
> The error is along the following lines:
>
>      2022-06-01 11:42:55 1nwHaM-004E3d-7A H=alt2.aspmx.l.google.com [142.251.9.27] TLS error on connection (recv): Error in the pull function.
>      2022-06-01 11:42:55 1nwHaM-004E3d-7A H=alt2.aspmx.l.google.com [142.251.9.27]: Remote host closed connection in response to end of data
>      2022-06-01 11:42:55 1nwHaM-004E3d-7A == support@xxxxxxxx R=dnslookup T=remote_smtp defer (-18) H=alt2.aspmx.l.google.com [142.251.9.27]: Remote host closed connection in response to end of data


Possibly another case of
https://lists.exim.org/lurker/message/20220429.095648.83dbd9f7.en.html

- for which the workaround was
        hosts_try_fastopen = !*.l.google.com
in the smtp transport, despite that being totally bogus given the
symptoms and protocol definitions involved.


If that doesn't help, other things to try disabling include
- chunking
- pipelining
- ipv6 (unlikely, given this was an ipv4 conn)

--
Cheers,
Jeremy