[Pkg-roundcube-maintainers] Bug#994446: roundcube-core: SMTP error message 'SMTP auth failed (250)'

[Olaf Zaplinski]

Package: roundcube
Version: 1.4.11+dfsg.1-4
Severity: grave
Justification: renders package unusable

Dear Maintainer,

on Debian 10, Roundcube worked as configured and could send emails to [::1]:25 without authentication as intended.
Now on Debian 11, it says that 'SMTP error (250) authentication failed' or so (my system is set to German).

The error message makes no sense. SMTP 250 reply code is 'ok'.

This is what Postfix logged:

Sep 16 08:19:17 binky postfix/smtpd[16110]: connect from ip6-localhost[::1]
Sep 16 08:19:17 binky postfix/smtpd[16110]: disconnect from ip6-localhost[::1] ehlo=1 quit=1 commands=2

This is no Postfix problem:

# telnet ::1 25
Trying ::1...
Connected to ::1.
Escape character is '^]'.
220 binky.tuxfriends.net ESMTP
ehlo foo
250-binky.tuxfriends.net
250-PIPELINING
250-SIZE 50000000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
mail from:<>
250 2.1.0 Ok
rcpt to:<olaf at zaplinski.de>
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
Subject: test

test
.
250 2.0.0 Ok: queued as 6F2AD1FC57
quit
221 2.0.0 Bye
Connection closed by foreign host.

-- System Information:
Debian Release: 11.0
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'oldstable-updates'), (500, 'stable'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-8-amd64 (SMP w/1 CPU thread)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages roundcube-core depends on:
ii  dbconfig-common                       2.0.19
ii  debconf [debconf-2.0]                 1.5.77
ii  dpkg                                  1.20.9
ii  libapache2-mod-php7.4 [libapache2-mo  7.4.21-1+deb11u1
ii  libjs-bootstrap4                      4.5.2+dfsg1-7
ii  libjs-codemirror                      5.59.2+~cs0.23.109-1
ii  libjs-jquery                          3.5.1+dfsg+~3.5.5-7
ii  libjs-jquery-minicolors               2.2.6+dfsg-4
ii  libjs-jquery-ui                       1.12.1+dfsg-8
ii  libjs-jstimezonedetect                1.0.6-5
ii  libmagic1                             1:5.39-3
ii  php                                   2:7.4+76
ii  php-auth-sasl                         1.1.0-1
ii  php-common                            2:76
ii  php-intl                              2:7.4+76
ii  php-mail-mime                         1.10.10-1
ii  php-masterminds-html5                 2.7.4+dfsg-2
ii  php-mbstring                          2:7.4+76
ii  php-net-sieve                         1.4.4-2
ii  php-net-smtp                          1.9.0-1
ii  php-net-socket                        1.2.2-2
ii  php-pear                              1:1.10.12+submodules+notgz+20210212-1
ii  php7.4 [php]                          7.4.21-1+deb11u1
ii  php7.4-cli [php-cli]                  7.4.21-1+deb11u1
ii  php7.4-intl [php-intl]                7.4.21-1+deb11u1
ii  php7.4-json [php-json]                7.4.21-1+deb11u1
ii  php7.4-mbstring [php-mbstring]        7.4.21-1+deb11u1
ii  roundcube-mysql                       1.4.11+dfsg.1-4
ii  ucf                                   3.0043

Versions of packages roundcube-core recommends:
ii  nginx-core [httpd-cgi]  1.18.0-6.1
ii  nginx-full [httpd-cgi]  1.18.0-6.1
ii  php-fpm                 2:7.4+76
ii  php-gd                  2:7.4+76
pn  php-pspell              <none>
ii  php7.4-fpm [php-fpm]    7.4.21-1+deb11u1
ii  php7.4-gd [php-gd]      7.4.21-1+deb11u1

Versions of packages roundcube-core suggests:
pn  php-crypt-gpg             <none>
pn  php-mkopinsky-zxcvbn-php  <none>
pn  php-net-ldap3             <none>
ii  roundcube-plugins         1.4.11+dfsg.1-4

-- debconf information:
  roundcube/password-confirm: (password omitted)
  roundcube/mysql/admin-pass: (password omitted)
  roundcube/mysql/app-pass: (password omitted)
  roundcube/app-password-confirm: (password omitted)
  roundcube/missing-db-package-error: abort
  roundcube/upgrade-error: abort
  roundcube/remote/port: 3306
* roundcube/dbconfig-install: false
  roundcube/remove-error: abort
  roundcube/restart-webserver: true
  roundcube/internal/skip-preseed: false
  roundcube/passwords-do-not-match:
  roundcube/mysql/method: Unix socket
  roundcube/remote/host: localhost
  roundcube/mysql/authplugin: default
  roundcube/db/dbname: roundcube
  roundcube/install-error: abort
  roundcube/upgrade-backup: true
  roundcube/reconfigure-webserver: apache2, lighttpd
  roundcube/dbconfig-remove: true
  roundcube/internal/reconfiguring: false
  roundcube/db/app-user:
  roundcube/dbconfig-upgrade: true
  roundcube/purge: false
  roundcube/remote/newhost:
  roundcube/language: en_US
  roundcube/hosts:
  roundcube/database-type: mysql
* roundcube/mysql/admin-user: root
  roundcube/dbconfig-reinstall: false