I get a significant number of failed SMTP sessions at gmail
(smtp.gmail.com::587). Connections start the same, but fail
when exim appears to not send an AUTH LOGIN command:
TCP_FASTOPEN tcpi_unacked 2
SMTP<< 220 smtp.gmail.com ESMTP q13sm8110474pfl.210 - gsmtp
SMTP>> EHLO k2di
SMTP<< 250-smtp.gmail.com at your service, [68.186.2.255]
250-SIZE 35882577
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 k2di
SMTP<< 250-smtp.gmail.com at your service, [68.186.2.255]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
=== succeeds ===
SMTP>> AUTH LOGIN
SMTP<< 334 VXNlcm5hbWU6
SMTP>> ****************************
SMTP<< 334 UGFzc3dvcmQ6
SMTP>> ************************
SMTP<< 235 2.7.0 Accepted
SMTP>> MAIL FROM:<gnxl@???> SIZE=1243 AUTH=abc@xyz
SMTP>> RCPT TO:<wymby@???>
will write message using CHUNKING
SMTP>> BDAT 243 LAST
SMTP<< 250 2.1.0 OK k9sm14509820pgg.50 - gsmtp
SMTP<< 250 2.1.5 OK k9sm14509820pgg.50 - gsmtp
SMTP<< 250 2.0.0 OK k9sm14509820pgg.50 - gsmtp
SMTP>> QUIT
=== fails ===
SMTP>> MAIL FROM:<gnxl@???> SIZE=1243
SMTP>> RCPT TO:<wymby@???>
will write message using CHUNKING
SMTP>> BDAT 243 LAST
SMTP<< 530-5.7.0 Authentication Required. Learn more at
530 5.7.0 https://support.google.com/mail/?p=WantAuthError q13sm811047=>4pfl.210 - gsmtp
SMTP<< 530-5.7.0 Authentication Required. Learn more at
530 5.7.0 https://support.google.com/mail/?p=WantAuthError q13sm8110474pfl.210 - gsmtp
SMTP>> QUIT
Failures happen with both of my gmail accounts. They seem to
be random; repeated identical attempts are unpredictable, and
it doesn't matter which gmail server IP address I'm connected
to. The transport's hosts_require_auth includes smtp.gmail.com.
I don't have the problem with (several) non-gmail servers.
I'm running 4.94.2-7 on Debian 11.2, and 4.95-4 on Debian sid.
Suggestions? Thanks.
