On Wed, 28 Sep 2022, Victor Sudakov via Exim-users wrote:

Dear Colleagues,

Has anyone had problems recently sending to aspmx.l.google.com ?

Yes. This is a known issue
        https://bugs.exim.org/show_bug.cgi?id=2907

The bug is not actually in exim, but in Linux kernel TCP Fast Open code shipped by at least Debian.

Sending gets stuck with the following error:

2022-09-27 21:09:48 1od0Ew-002IUh-GS H=alt2.aspmx.l.google.com [64.233.171.27] 
TLS error on connection (recv): Error in the pull function.
2022-09-27 21:09:48 1od0Ew-002IUh-GS H=alt2.aspmx.l.google.com [64.233.171.27]: 
Remote host closed connection in response to end of data

Below is a complete session log, any ideas what could be wrong? There
is a very long waiting after "BDAT". "mail.XXXXX.com" is my host (Exim 
4.94.2/Debian11).


delivering 1od0Ew-002IUh-GS
Connecting to aspmx.l.google.com [74.125.195.26]:25 ...  TFO mode sendto, no 
data: EINPROGRESS
connected
TCP_FASTOPEN tcpi_unacked 2
 SMTP<< 220 mx.google.com ESMTP 
jf4-20020a170903268400b00178a33f8bb4si3653473plb.328 - gsmtp
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-STARTTLS
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> STARTTLS
 SMTP<< 220 2.0.0 Ready to start TLS
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> MAIL FROM:<anat...@xxxxx.com> SIZE=126042
 SMTP>> RCPT TO:<guadalupe.gonza...@yyyyy.com>
        will write message using CHUNKING
 SMTP>> BDAT 2461
 SMTP<< 250 2.1.0 OK jf4-20020a170903268400b00178a33f8bb4si3653473plb.328 - 
gsmtp
 SMTP<< 250 2.1.5 OK jf4-20020a170903268400b00178a33f8bb4si3653473plb.328 - 
gsmtp
 SMTP<< 250 2.0.0 OK jf4-20020a170903268400b00178a33f8bb4si3653473plb.328 - 
gsmtp
 SMTP>> BDAT 122930 LAST
LOG: MAIN
 H=aspmx.l.google.com [74.125.195.26] TLS error on connection (recv): Error in 
the pull function.
 SMTP(Connection reset by peer)<<
LOG: MAIN
 H=aspmx.l.google.com [74.125.195.26]: Remote host closed connection in 
response to end of data
 SMTP(close)>>
Connecting to alt1.aspmx.l.google.com [142.250.115.26]:25 ...  TFO mode sendto, 
no data: EINPROGRESS
connected
TCP_FASTOPEN tcpi_unacked 2
 SMTP<< 220 mx.google.com ESMTP 
ch9-20020a0568081c0900b0033a712a247fsi3588254oib.216 - gsmtp
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-STARTTLS
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> STARTTLS
 SMTP<< 220 2.0.0 Ready to start TLS
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> MAIL FROM:<anat...@xxxxx.com> SIZE=126042
 SMTP>> RCPT TO:<guadalupe.gonza...@yyyyy.com>
        will write message using CHUNKING
 SMTP>> BDAT 2461
 SMTP<< 250 2.1.0 OK ch9-20020a0568081c0900b0033a712a247fsi3588254oib.216 - 
gsmtp
 SMTP<< 250 2.1.5 OK ch9-20020a0568081c0900b0033a712a247fsi3588254oib.216 - 
gsmtp
 SMTP<< 250 2.0.0 OK ch9-20020a0568081c0900b0033a712a247fsi3588254oib.216 - 
gsmtp
 SMTP>> BDAT 122930 LAST
LOG: MAIN
 H=alt1.aspmx.l.google.com [142.250.115.26] TLS error on connection (recv): 
Error in the pull function.
 SMTP(Connection reset by peer)<<
LOG: MAIN
 H=alt1.aspmx.l.google.com [142.250.115.26]: Remote host closed connection in 
response to end of data
 SMTP(close)>>
Connecting to alt2.aspmx.l.google.com [64.233.171.27]:25 ...  TFO mode sendto, 
no data: EINPROGRESS
connected
TCP_FASTOPEN tcpi_unacked 2
 SMTP<< 220 mx.google.com ESMTP 
u26-20020a056871009a00b001278ca86aaesi3664331oaa.13 - gsmtp
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-STARTTLS
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> STARTTLS
 SMTP<< 220 2.0.0 Ready to start TLS
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> MAIL FROM:<anat...@xxxxx.com> SIZE=126042
 SMTP>> RCPT TO:<guadalupe.gonza...@yyyyy.com>
        will write message using CHUNKING
 SMTP>> BDAT 2461
 SMTP<< 250 2.1.0 OK u26-20020a056871009a00b001278ca86aaesi3664331oaa.13 - gsmtp
 SMTP<< 250 2.1.5 OK u26-20020a056871009a00b001278ca86aaesi3664331oaa.13 - gsmtp
 SMTP<< 250 2.0.0 OK u26-20020a056871009a00b001278ca86aaesi3664331oaa.13 - gsmtp
 SMTP>> BDAT 122930 LAST
LOG: MAIN
 H=alt2.aspmx.l.google.com [64.233.171.27] TLS error on connection (recv): 
Error in the pull function.
 SMTP(Connection reset by peer)<<
LOG: MAIN
 H=alt2.aspmx.l.google.com [64.233.171.27]: Remote host closed connection in 
response to end of data
 SMTP(close)>>
Connecting to alt4.aspmx.l.google.com [172.253.113.26]:25 ...  TFO mode sendto, 
no data: EINPROGRESS
connected
TCP_FASTOPEN tcpi_unacked 2
 SMTP<< 220 mx.google.com ESMTP 
e19-20020a255013000000b006a8e0f13291si3992630ybb.42 - gsmtp
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-STARTTLS
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> STARTTLS
 SMTP<< 220 2.0.0 Ready to start TLS
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> MAIL FROM:<anat...@xxxxx.com> SIZE=126042
 SMTP>> RCPT TO:<guadalupe.gonza...@yyyyy.com>
        will write message using CHUNKING
 SMTP>> BDAT 2461
 SMTP<< 250 2.1.0 OK e19-20020a255013000000b006a8e0f13291si3992630ybb.42 - gsmtp
 SMTP<< 250 2.1.5 OK e19-20020a255013000000b006a8e0f13291si3992630ybb.42 - gsmtp
 SMTP<< 250 2.0.0 OK e19-20020a255013000000b006a8e0f13291si3992630ybb.42 - gsmtp
 SMTP>> BDAT 122930 LAST
LOG: MAIN
 H=alt4.aspmx.l.google.com [172.253.113.26] TLS error on connection (recv): 
Error in the pull function.
 SMTP(Connection reset by peer)<<
LOG: MAIN
 H=alt4.aspmx.l.google.com [172.253.113.26]: Remote host closed connection in 
response to end of data
 SMTP(close)>>
Connecting to alt3.aspmx.l.google.com [142.250.152.27]:25 ...  TFO mode sendto, 
no data: EINPROGRESS
connected
TCP_FASTOPEN tcpi_unacked 2
 SMTP<< 220 mx.google.com ESMTP 
z12-20020a056e0217cc00b002f8140b4ff3si4988948ilu.103 - gsmtp
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-STARTTLS
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> STARTTLS
 SMTP<< 220 2.0.0 Ready to start TLS
 SMTP>> EHLO mail.XXXXX.com
 SMTP<< 250-mx.google.com at your service, [54.148.163.217]
        250-SIZE 157286400
        250-8BITMIME
        250-ENHANCEDSTATUSCODES
        250-PIPELINING
        250-CHUNKING
        250 SMTPUTF8
 SMTP>> MAIL FROM:<anat...@xxxxx.com> SIZE=126042
 SMTP>> RCPT TO:<guadalupe.gonza...@yyyyy.com>
        will write message using CHUNKING
 SMTP>> BDAT 2461
 SMTP<< 250 2.1.0 OK z12-20020a056e0217cc00b002f8140b4ff3si4988948ilu.103 - 
gsmtp
 SMTP<< 250 2.1.5 OK z12-20020a056e0217cc00b002f8140b4ff3si4988948ilu.103 - 
gsmtp
 SMTP<< 250 2.0.0 OK z12-20020a056e0217cc00b002f8140b4ff3si4988948ilu.103 - 
gsmtp
 SMTP>> BDAT 122930 LAST
LOG: MAIN
 H=alt3.aspmx.l.google.com [142.250.152.27] TLS error on connection (recv): 
Error in the pull function.
 SMTP(Connection reset by peer)<<
LOG: MAIN
 H=alt3.aspmx.l.google.com [142.250.152.27]: Remote host closed connection in 
response to end of data
 SMTP(close)>>
LOG: MAIN
 == guadalupe.gonza...@yyyyy.com R=dnslookup T=remote_smtp defer (-18) 
H=alt3.aspmx.l.google.com [142.250.152.27]: Remote host closed connection in 
response to end of data


--
Victor Sudakov VAS4-RIPE
http://vas.tomsk.ru/
2:5005/49@fidonet

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--
Andrew C. Aitchison                      Kendal, UK
                   and...@aitchison.me.uk

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