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Email has stopped flowing with error 554 5.7.1 <DATA>: Data command rejected: Recipient access denied;
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After a set of package upgrades Friday 17 May, I can no longer send or receive email. Incoming mail gets the message above and outgoing sees:
554 5.7.1 <DATA>: Data command rejected: Sender access denied;

I have worked around the issue by making the verify_sender() and verify_recipient() methods in /usr/lib/postfix/kolab_smtp_access_policy simply return true. This is not ideal but neither is all of my mail bouncing.

At least one other user on the is seeing the same behavior on CentOS.

This is running on an up to date Ubuntu 18.04 install. Is there anything more that might be helpful in diagnosing?

dpkg -l *kolab*
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                     Version                   Architecture              Description
ii  kolab                                    16.0.1-17                 all                       Metapackage for Kolab Groupware Server
ii  kolab-cli                                0.8.11-0~kolab2           all                       Command-line utilities for Kolab
ii  kolab-conf                               0.8.11-0~kolab2           all                       Configuration management for Kolab
un  kolab-content-filter                     <none>                    <none>                    (no description available)
ii  kolab-freebusy                           1.1.2-0~kolab2            all                       Free/Busy for Kolab Groupware
ii  kolab-imap                               16.0.1-17                 all                       IMAP server for Kolab Groupware server
ii  kolab-ldap                               16.0.1-17                 all                       LDAP server for Kolab Groupware server
ii  kolab-mta                                16.0.1-17                 all                       MTA server for Kolab Groupware server
ii  kolab-saslauthd                          0.8.11-0~kolab2           all                       SASL Authentication Daemon for Kolab
ii  kolab-schema                             3.3-0~kolab1              all                       LDAP schema files for Kolab Groupware
ii  kolab-server                             0.8.11-0~kolab2           all                       Kolab Groupware Server
ii  kolab-syncroton                          2.3.15-0~kolab5           all                       ActiveSync for Kolab Groupware
ii  kolab-webadmin                           3.2.12-0~kolab1           all                       Kolab administration web interface
ii  kolab-webclient                          16.0.1-17                 all                       Webmail client for Kolab Groupware server
ii  kolab-xml                                0.8.11-0~kolab2           all                       Kolab XML format wrapper for pykolab
un  libkolab0                                <none>                    <none>                    (no description available)
ii  libkolab2                                2.0~dev20151230-0~kolab8  amd64                     Maps KDE containers to Kolab formats
un  libkolabxml1                             <none>                    <none>                    (no description available)
ii  libkolabxml1v5                           1.2.0-0~kolab2            amd64                     Libkolabxml is the reference implementation of the Kolab XML format
ii  php-kolab                                2.0~dev20151230-0~kolab8  amd64                     PHP bindings for Kolab Library
un  php-kolab-kde                            <none>                    <none>                    (no description available)
ii  php-kolabformat                          1.2.0-0~kolab2            amd64                     PHP bindings for Kolab Format 3.0 XML parsing
ii  pykolab                                  0.8.11-0~kolab2           all                       Kolab Groupware daemon and utilities
ii  python-kolab                             2.0~dev20151230-0~kolab8  amd64                     Python bindings for Kolab Library
un  python-kolab-kde                         <none>                    <none>                    (no description available)
ii  python-kolabformat                       1.2.0-0~kolab2            amd64                     Python bindings for Kolab Format 3.0 XML parsing
un  roundcube-plugins-kolab                  <none>                    <none>                    (no description available)
ii  roundcubemail-plugin-kolab-activesync    1:3.4.5-0~kolab5          all                       kolab_activesync plugin for Roundcube
ii  roundcubemail-plugin-kolab-addressbook   1:3.4.5-0~kolab5          all                       kolab_addressbook plugin for Roundcube
ii  roundcubemail-plugin-kolab-auth          1:3.4.5-0~kolab5          all                       kolab_auth plugin for Roundcube
ii  roundcubemail-plugin-kolab-config        1:3.4.5-0~kolab5          all                       kolab_config plugin for Roundcube
ii  roundcubemail-plugin-kolab-delegation    1:3.4.5-0~kolab5          all                       kolab_delegation plugin for Roundcube
ii  roundcubemail-plugin-kolab-files         1:3.4.5-0~kolab5          all                       kolab_files plugin for Roundcube
ii  roundcubemail-plugin-kolab-folders       1:3.4.5-0~kolab5          all                       kolab_folders plugin for Roundcube
ii  roundcubemail-plugin-kolab-notes         1:3.4.5-0~kolab5          all                       kolab_notes plugin for Roundcube
ii  roundcubemail-plugin-kolab-tags          1:3.4.5-0~kolab5          all                       kolab_tags plugin for Roundcube
ii  roundcubemail-plugin-libkolab            1:3.4.5-0~kolab5          all                       libkolab plugin for Roundcube
ii  roundcubemail-plugins-kolab              1:3.4.5-0~kolab5          all                       skinnable AJAX based webmail solution - Kolab plugins
ii  roundcubemail-skin-kolab                 0.4.1-0~kolab2            all                       skinnable AJAX based webmail solution - Plesk skin


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