Re: [exim] Some Emails to gmail now hang

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Author: graeme
Date:  
To: 'Marc MERLIN', exim-users
Subject: Re: [exim] Some Emails to gmail now hang
This does sound something like this issue I blogged about:
https://www.chromosphere.co.uk/2022/06/01/googles-tcp-fast-open-breaks-exim-
delivery/

The workround I have (so far!) successfully implemented with the same
version of Exim on Debian 11 is:

hosts_try_fastopen = !*.l.google.com

into /etc/exim4/conf.d/transports/30_exim4-config_remote_smtp (or whichever
config the remote transport is in depending on how you have installed Exim
on Debian).

HTH

Graeme

-----Original Message-----
From: Exim-users <exim-users-bounces+graeme=chromosphere.co.uk@???> On
Behalf Of Marc MERLIN via Exim-users
Sent: 10 August 2022 01:03
To: exim-users@???
Subject: [exim] Some Emails to gmail now hang

This started about a week ago, exim 4.94.2 on debian.

I tried disabling chunking ( hosts_try_chunking = ) and it didn't help

Some Emails to gmail get here, some don't. It seems content dependent. It
could be as if gmail is actually teergrubbing me :)

Connecting to gmail-smtp-in.l.google.com [2607:f8b0:4023:c0d::1a]:25 ...
failed: Cannot assign requested address
LOG: MAIN
H=gmail-smtp-in.l.google.com [2607:f8b0:4023:c0d::1a] Cannot assign
requested address Connecting to gmail-smtp-in.l.google.com [142.251.2.27]:25
... TFO mode sendto, no data: EINPROGRESS connected TCP_FASTOPEN
tcpi_unacked 2
SMTP<< 220 mx.google.com ESMTP
l193-20020a6391ca000000b0041b8f2bd530si11447438pge.217 - gsmtp
SMTP>> EHLO mail1.merlins.org
  SMTP<< 250-mx.google.com at your service, [209.81.13.136]
         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 mail1.merlins.org
  SMTP<< 250-mx.google.com at your service, [209.81.13.136]
         250-SIZE 157286400
         250-8BITMIME
         250-ENHANCEDSTATUSCODES
         250-PIPELINING
         250-CHUNKING
         250 SMTPUTF8

SMTP>> MAIL FROM:<foo> SIZE=111056
SMTP>> RCPT TO:<merlin@???>
         will write message using CHUNKING

SMTP>> BDAT 4562
SMTP<< 250 2.1.0 OK l193-20020a6391ca000000b0041b8f2bd530si11447438pge.217
- gsmtp
SMTP<< 250 2.1.5 OK l193-20020a6391ca000000b0041b8f2bd530si11447438pge.217
- gsmtp
SMTP<< 250 2.0.0 OK l193-20020a6391ca000000b0041b8f2bd530si11447438pge.217
- gsmtp
SMTP>> BDAT 105345 LAST
<hangs here>


nnecting to gmail-smtp-in.l.google.com [142.251.2.27]:25 ... TFO mode
sendto, no data: EINPROGRESS connected TCP_FASTOPEN tcpi_unacked 2
SMTP<< 220 mx.google.com ESMTP
n23-20020a170902969700b0016ef3d9ed6bsi14752543plp.530 - gsmtp
SMTP>> EHLO mail1.merlins.org
  SMTP<< 250-mx.google.com at your service, [209.81.13.136]
         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 mail1.merlins.org
  SMTP<< 250-mx.google.com at your service, [209.81.13.136]
         250-SIZE 157286400
         250-8BITMIME
         250-ENHANCEDSTATUSCODES
         250-PIPELINING
         250-CHUNKING
         250 SMTPUTF8

SMTP>> MAIL FROM:<foo> SIZE=111056
SMTP>> RCPT TO:<merlin@???>
SMTP>> DATA
SMTP<< 250 2.1.0 OK n23-20020a170902969700b0016ef3d9ed6bsi14752543plp.530
- gsmtp
SMTP<< 250 2.1.5 OK n23-20020a170902969700b0016ef3d9ed6bsi14752543plp.530
- gsmtp
SMTP<< 354 Go ahead n23-20020a170902969700b0016ef3d9ed6bsi14752543plp.530
- gsmtp
SMTP>> writing message and terminating "."
<hangs here>

-d+all shows
16:52:41 5682 Calling gnutls_record_recv(session=0x5594689d08e0,
buffer=0x5594689e5ae0, len=4096)
16:52:41 5682 read response data: size=72
16:52:41 5682 SMTP<< 250 2.1.0 OK
30-20020a17090a035e00b001f57a54c7aasi385374pjf.69 - gsmtp
16:52:41 5682 sync_responses expect rcpt
16:52:41 5682 Calling gnutls_record_recv(session=0x5594689d08e0,
buffer=0x5594689e5ae0, len=4096)
16:52:41 5682 read response data: size=72
16:52:41 5682 SMTP<< 250 2.1.5 OK
30-20020a17090a035e00b001f57a54c7aasi385374pjf.69 - gsmtp
16:52:41 5682 look for one response for BDAT
16:52:41 5682 Calling gnutls_record_recv(session=0x5594689d08e0,
buffer=0x5594689e5ae0, len=4096)
16:52:41 5682 read response data: size=72
16:52:41 5682 SMTP<< 250 2.0.0 OK
30-20020a17090a035e00b001f57a54c7aasi385374pjf.69 - gsmtp
16:52:41 5682 SMTP>> BDAT 105345 LAST
16:52:41 5682 cmd buf flush 18 bytes (more expected)
16:52:41 5682 gnutls_record_cork(session=0x5594689d08e0)
16:52:41 5682 tls_write(0x5594689e6ae0, 18, more)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594689e6ae0, left=18)
16:52:41 5682 outbytes=18
16:52:41 5682 cannot use sendfile for body: spoolfile not wireformat
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 gnutls_record_uncork(session=0x5594689d08e0)
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutl_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 flushing headers buffer
16:52:41 5682 writing data block fd=7 size=8191 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 8191)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=8191)
16:52:41 5682 outbytes=8191
16:52:41 5682 writing data block fd=7 size=7053 timeout=300
16:52:41 5682 tls_write(0x5594688fabf0, 7053)
16:52:41 5682 gnutls_record_send(session=0x5594689d08e0,
buffer=0x5594688fabf0, left=7053)
16:52:41 5682 outbytes=7053
<hangs here>

--
"A mouse is a device used to point at the xterm you want to type in" -
A.S.R.

Home page: http://marc.merlins.org/

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