Affected source packages:

akonadi                                                                                                                                                                   
akonadi4                                                                                                                                                                  
kleopatra                                                                                                                                                                 
                                                                                                                                                                          
kalarmcal
kdepimlibs                                                                                                                                                                
kf5-kdepimlibs                                                                                                                                                                                                                                                                                                                                      
akonadi-search                                                                                                                                                            
kjots                                                                                                                                                                     
kmailtransport                                                                                                                                                            
libkolab                                                                                                                                                                  
kdepim4                                                                                                                                                                   
                                                                                                                                                                          
akonadi-calendar                                                                                                                                                          
libkf5libkdepim                                                                                                                                                           
                                                                                                                                                                          
kdepim-runtime                                                                                                                                                            
libkf5mailimporter                                                                                                                                                        
libkf5pimcommon

kf5-kdepim-apps-libs
libkf5gravatar
libkf5ksieve                                                                                                                                                               
kf5-messagelib
libkf5calendarsupport

libkf5eventviews
libkf5mailcommon

libkf5incidenceeditor

kdepim
kdepim-addons

The list of affected binary packages is:

akonadi-server
libkf5akonadi-dev
libkf5akonadi-dev-bin
libkf5akonadiagentbase5
libkf5akonadicore5
libkf5akonadicore-bin
libkf5akonadiwidgets5
libkf5akonadixml5
libkf5akonadiprivate5
libkf5akonadiserver-dev
akonadi-backend-mysql
akonadi-backend-postgresql
akonadi-backend-sqlite

libakonadiprotocolinternals1
libakonadi-dev

kleopatra

libkf5alarmcalendar-dev
libkf5alarmcalendar5

kdepimlibs5-dev
kdepimlibs-kio-plugins
libakonadi-contact4
libakonadi-kabc4
libakonadi-kcal4
libakonadi-kde4
libakonadi-kmime4
libakonadi-socialutils4
libakonadi-notes4
libakonadi-xml4
libgpgme++2v5
libkabc4
libkblog4
libkalarmcal2
libkcal4
libkcalcore4
libkcalutils4
libkholidays4
libkimap4
libkldap4
libkmbox4
libakonadi-calendar4
libkmime4
libkontactinterface4a
libkpimidentities4
libkpimtextedit4
libkpimutils4
libkresources4
libktnef4
libkxmlrpcclient4
libmailtransport4
libmicroblog4
libqgpgme1
libsyndication4
kdepimlibs-dbg

kf5-kdepimlibs-kio-plugins
kdepimlibs-data
libkf5akonadicontact5
libkf5akonadicontact-dev
libkf5akonadimime5
libkf5akonadimime-dev
libakonadi-kf5
libkf5akonadisocialutils5
libkf5akonadisocialutils-dev
libkf5akonadinotes5
libkf5akonadinotes-dev

libkf5akonadisearch-dev
libkf5akonadisearch-bin
libkf5akonadisearch-plugins
libkf5akonadisearch-data
libkf5akonadisearchpim5
libkf5akonadisearchxapian5
libkf5akonadisearchcore5
libkf5akonadisearchdebug5

kjots

libkf5mailtransport-dev
libkf5mailtransport-data
kde-config-mailtransport
libkf5mailtransport5

knode
ktimetracker
libcalendarsupport4
libincidenceeditorsng4
libpimcommon4
libkdepim4
libkdepimdbusinterfaces4
libkdgantt2-0
libkleo4
libkpgp4
libmailcommon4
libmailimporter4
libmessagecomposer4
libmessagecore4
libmessageviewer4
libsendlater4
libtemplateparser4

libkf5akonadicalendar-dev
libkf5akonadicalendar5

libkf5libkdepim5
libkf5libkdepim-data
libkf5libkdepim-plugins
libkf5libkdepim-dev

kdepim-runtime

libkf5mailimporter5
libkf5mailimporter-dev

libkf5pimcommon5
libkf5pimcommon-data
libkf5pimcommon-plugins
libkf5pimcommon-dev

kf5-kdepim-apps-libs-data
libkf5composereditorng5
libkf5composereditorng-dev
libkf5followupreminder5
libkf5followupreminder-dev
libkf5kaddressbookgrantlee5
libkf5kaddressbookgrantlee-dev
libkf5kdepimdbusinterfaces5
libkf5kdepimdbusinterfaces-dev
libkf5sendlater5
libkf5sendlater-dev

libkf5gravatar5
libkf5gravatar-dev

libkf5ksieve5
libkf5ksieve-data
libkf5kmanagesieve5
libkf5ksieveui5
libkf5ksieve-dev

kf5-messagelib-data
libkf5messagecomposer5
libkf5messagecomposer-dev
libkf5messagecore5
libkf5messagecore-dev
libkf5messagelist5
libkf5messagelist-dev
libkf5messageviewer5
libkf5messageviewer-dev
libkf5templateparser5
libkf5templateparser-dev

libkf5calendarsupport5
libkf5calendarsupport-data
libkf5calendarsupport-dev

libkf5eventviews5
libkf5eventviews-data
libkf5eventviews-dev

libkf5mailcommon5
libkf5mailcommon-plugins
libkf5mailcommon-dev

libkf5incidenceeditor5
libkf5incidenceeditor-bin
libkf5incidenceeditor-dev

kdepim
kdepim-doc
akregator
accountwizard
kaddressbook
kalarm
storageservicemanager
kmail
knotes
konsolekalendar
kontact
korganizer
blogilo
akonadiconsole
ktnef
kdepim-themeeditors

kdepim-addons

A basic apt_preferences rule to avoid installing it could be:

Package: akonadi-server libkf5akonadi-dev libkf5akonadi-dev-bin libkf5akonadiagentbase5 libkf5akonadicore5 libkf5akonadicore-bin libkf5akonadiwidgets5 libkf5akonadixml5 libkf5akonadiprivate5 libkf5akonadiserver-dev akonadi-backend-mysql akonadi-backend-postgresql akonadi-backend-sqlite libakonadiprotocolinternals1 libakonadi-dev kleopatra libkf5alarmcalendar-dev libkf5alarmcalendar5 kdepimlibs5-dev kdepimlibs-kio-plugins libakonadi-contact4 libakonadi-kabc4 libakonadi-kcal4 libakonadi-kde4 libakonadi-kmime4 libakonadi-socialutils4 libakonadi-notes4 libakonadi-xml4 libgpgme++2v5 libkabc4 libkblog4 libkalarmcal2 libkcal4 libkcalcore4 libkcalutils4 libkholidays4 libkimap4 libkldap4 libkmbox4 libakonadi-calendar4 libkmime4 libkontactinterface4a libkpimidentities4 libkpimtextedit4 libkpimutils4 libkresources4 libktnef4 libkxmlrpcclient4 libmailtransport4 libmicroblog4 libqgpgme1 libsyndication4 kdepimlibs-dbg kf5-kdepimlibs-kio-plugins kdepimlibs-data libkf5akonadicontact5 libkf5akonadicontact-dev libkf5akonadimime5 libkf5akonadimime-dev libakonadi-kf5 libkf5akonadisocialutils5 libkf5akonadisocialutils-dev libkf5akonadinotes5 libkf5akonadinotes-dev libkf5akonadisearch-dev libkf5akonadisearch-bin libkf5akonadisearch-plugins libkf5akonadisearch-data libkf5akonadisearchpim5 libkf5akonadisearchxapian5 libkf5akonadisearchcore5 libkf5akonadisearchdebug5 kjots libkf5mailtransport-dev libkf5mailtransport-data kde-config-mailtransport libkf5mailtransport5 knode ktimetracker libcalendarsupport4 libincidenceeditorsng4 libpimcommon4 libkdepim4 libkdepimdbusinterfaces4 libkdgantt2-0 libkleo4 libkpgp4 libmailcommon4 libmailimporter4 libmessagecomposer4 libmessagecore4 libmessageviewer4 libsendlater4 libtemplateparser4 libkf5akonadicalendar-dev libkf5akonadicalendar5 libkf5libkdepim5 libkf5libkdepim-data libkf5libkdepim-plugins libkf5libkdepim-dev kdepim-runtime libkf5mailimporter5 libkf5mailimporter-dev libkf5pimcommon5 libkf5pimcommon-data libkf5pimcommon-plugins libkf5pimcommon-dev kf5-kdepim-apps-libs-data libkf5composereditorng5 libkf5composereditorng-dev libkf5followupreminder5 libkf5followupreminder-dev libkf5kaddressbookgrantlee5 libkf5kaddressbookgrantlee-dev libkf5kdepimdbusinterfaces5 libkf5kdepimdbusinterfaces-dev libkf5sendlater5 libkf5sendlater-dev libkf5gravatar5 libkf5gravatar-dev libkf5ksieve5 libkf5ksieve-data libkf5kmanagesieve5 libkf5ksieveui5 libkf5ksieve-dev kf5-messagelib-data libkf5messagecomposer5 libkf5messagecomposer-dev libkf5messagecore5 libkf5messagecore-dev libkf5messagelist5 libkf5messagelist-dev libkf5messageviewer5 libkf5messageviewer-dev libkf5templateparser5 libkf5templateparser-dev libkf5calendarsupport5 libkf5calendarsupport-data libkf5calendarsupport-dev libkf5eventviews5 libkf5eventviews-data libkf5eventviews-dev libkf5mailcommon5 libkf5mailcommon-plugins libkf5mailcommon-dev libkf5incidenceeditor5 libkf5incidenceeditor-bin libkf5incidenceeditor-dev kdepim kdepim-doc akregator accountwizard kaddressbook kalarm storageservicemanager kmail knotes konsolekalendar kontact korganizer blogilo akonadiconsole ktnef kdepim-themeeditors kdepim-addons
Pin: release a=unstable
Pin-Priority: 50