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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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Description

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 users@list.kolab.org 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*
Desired=Unknown/Install/Remove/Purge/Hold
| 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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