Extract from Stretch upgrade log:
$ grep cyrus screenlog.0
cups-driver-gutenprint cyrus-admin-2.4 cyrus-imapd-2.4 easytag fonts-droid
gnuplot-tex golang-go-linux-amd64
cyrus-admin cyrus-common cyrus-imapd d-shlibs dash davfs2 davical
db-upgrade-util db-util db5.3-util dbconfig-common
libcurl3 libcurl3:i386 libcurl3-gnutls libcurl4-gnutls-dev libcyrus-imap-perl
libdata-optlist-perl libdate-manip-perl
cups-filters cups-filters-core-drivers cups-ppdc curl cyrus-admin
cyrus-common cyrus-imapd debhelper debugedit
libcurl4-gnutls-dev libcyrus-imap-perl libdbd-mysql-perl libdbd-pg-perl
libdbd-sqlite3-perl libdbi-perl libdee-1.0-4
cups-filters cups-filters-core-drivers cups-ppdc curl cyrus-admin
cyrus-common cyrus-imapd debhelper debugedit
libcurl4-gnutls-dev libcyrus-imap-perl libdbd-mysql-perl libdbd-pg-perl
libdbd-sqlite3-perl libdbi-perl libdee-1.0-4
cups-filters cups-filters-core-drivers cups-ppdc curl cyrus-admin
cyrus-common cyrus-imapd debhelper debugedit
libcurl4-gnutls-dev libcyrus-imap-perl libdbd-mysql-perl libdbd-pg-perl
libdbd-sqlite3-perl libdbi-perl libdee-1.0-4
cups-driver-gutenprint cyrus-admin-2.4 cyrus-imapd-2.4 easytag fonts-droid
gnuplot-tex golang-go-linux-amd64
cups-filters cups-filters-core-drivers cups-ppdc curl cyrus-admin
cyrus-common cyrus-imapd debhelper debugedit
libcurl4-gnutls-dev libcyrus-imap-perl libdbd-mysql-perl libdbd-pg-perl
libdbd-sqlite3-perl libdbi-perl libdee-1.0-4
serious bugs of cyrus-admin (2.4.17+nocaldav-0+deb8u2 → 2.5.10-3) <Resolved in
some Version>
b25 - #872247 - cyrus-admin: broken symlink: /usr/bin/{installsieve, sieveshell} -> ../sbin/cyrus (Fixed:
cyrus-imapd/2.5.11-1)
serious bugs of cyrus-imapd (2.4.17+nocaldav-0+deb8u2 → 2.5.10-3) <Resolved in
some Version>
b26 - #863520 - cyrus-imapd version 2.5.10-3 Fatal error with SSL (Fixed:
cyrus-imapd/2.5.11-1)
b27 - #879007 - cyrus-imapd does not accept new connections (Fixed:
cyrus-imapd/2.5.11-1)
libc6(1 bug), libc6:i386(1 bug), nfs-common(1 bug), libreoffice-common(1 bug), apt(1 bug), libmariadbclient18(1 bug),
libqtcore4-perl(1 bug), libxml-parser-perl(1 bug), libpolkit-qt5-1-1(1 bug), wget(1 bug), xserver-xorg-video-amdgpu(1
bug), ruby2.3(2 bugs), xfce4-weather-plugin(1 bug), libvirt-clients(1 bug), cyrus-admin(1 bug), cyrus-imapd(2 bugs),
isc-dhcp-server(1 bug), python3-pysimplesoap(1 bug), bridge-utils(2 bugs), firefox-esr(1 bug), libyaml-libyaml-perl(1
bug), mercurial(1 bug), network-manager-openvpn(1 bug), pdftk(1 bug), speech-dispatcher(1 bug), xorg(2 bugs), calibre(1
bug), phpmyadmin(1 bug)
Preparing to unpack .../libcyrus-imap-perl_2.5.10-3_amd64.deb ...
Unpacking libcyrus-imap-perl (2.5.10-3) over (2.4.17+nocaldav-0+deb8u2) ...
Removing cyrus-admin-2.4 (2.4.17+nocaldav-0+deb8u2) ...
Removing cyrus-imapd-2.4 (2.4.17+nocaldav-0+deb8u2) ...
Preparing to unpack .../cyrus-admin_2.5.10-3_all.deb ...
Unpacking cyrus-admin (2.5.10-3) over (2.4.17+nocaldav-0+deb8u2) ...
Preparing to unpack .../cyrus-imapd_2.5.10-3_amd64.deb ...
Unpacking cyrus-imapd (2.5.10-3) over (2.4.17+nocaldav-0+deb8u2) ...
Preparing to unpack .../cyrus-common_2.5.10-3_amd64.deb ...
Unpacking cyrus-common (2.5.10-3) over (2.4.17+nocaldav-0+deb8u2) ...
Setting up libcyrus-imap-perl (2.5.10-3) ...
Setting up cyrus-admin (2.5.10-3) ...
Setting up cyrus-common (2.5.10-3) ...
Installing new version of config file /etc/cron.daily/cyrus-imapd ...
Configuration file '/etc/cyrus.conf'
*** cyrus.conf (Y/I/N/O/D/Z) [default=N] ?
Installing new version of config file /etc/default/cyrus-imapd ...
Installing new version of config file /etc/init.d/cyrus-imapd ...
Creating/updating cyrus user account...
The user `cyrus' is already a member of `sasl'.
Converting from /var/lib/cyrus/annotations.db (skiplist) to
/tmp/annotations.db.opiLaFRT (twoskip)
Converting from /var/lib/cyrus/deliver.db (skiplist) to
/tmp/deliver.db.m12IrgaP (twoskip)
Converting from /var/lib/cyrus/mailboxes.db (skiplist) to
/tmp/mailboxes.db.lxOPAQYq (twoskip)
Setting up cyrus-imapd (2.5.10-3) ...
Installing new version of config file /etc/fail2ban/filter.d/cyrus-imap.conf ...
