[exim] SMTP errors with google

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Autor: Rory Campbell-Lange
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Dla: exim-users
Temat: [exim] SMTP errors with google
My company's servers are having some curious issues sending some email to google, running exim on Debian.

    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


Here is the (slightly anonymised) output from `swaks -a -tls -q HELO -s 127.0.0.1:25 -ap '<>'`

    root@mailserver:/etc/exim4# swaks -a -tls -q HELO -s 127.0.0.1:25 -ap '<>'
    Username:
    === Trying 127.0.0.1:25...
    === Connected to 127.0.0.1.
    <-  220 mailserver.xxxxxx.net ESMTP Exim 4.94.2 Wed, 01 Jun 2022 12:02:32 +0100
     -> EHLO mailserver.xxxxxx.net
    <-  250-mailserver.xxxxxx.net Hello mailserver.rotamap.net [127.0.0.1]
    <-  250-SIZE 52428800
    <-  250-8BITMIME
    <-  250-PIPELINING
    <-  250-PIPE_CONNECT
    <-  250-CHUNKING
    <-  250-STARTTLS
    <-  250-PRDR
    <-  250-SMTPUTF8
    <-  250 HELP
     -> STARTTLS
    <-  220 TLS go ahead
    === TLS started with cipher TLSv1.3:TLS_AES_256_GCM_SHA384:256
    === TLS no local certificate set
    === TLS peer DN="/CN=*.xxxxxx.net"
     ~> EHLO mailserver.xxxxxx.net
    <~  250-mailserver.xxxxxx.net Hello mailserver.rotamap.net [127.0.0.1]
    <~  250-SIZE 52428800
    <~  250-8BITMIME
    <~  250-PIPELINING
    <~  250-PIPE_CONNECT
    <~  250-CHUNKING
    <~  250-PRDR
    <~  250-SMTPUTF8
    <~  250 HELP
     ~> QUIT
    <~  221 mailserver.xxxxxx.net closing connection


Any thoughts?

Many thanks,
Rory