cyrus-imap: mail delivery to mailbox fails after upgrade from SLES 11 SP4 to SLES 15

zypper in dovecot

The dovecot-wiki provides a link to a script which help you to do the database migration. There is also an introduction to dovecot configuration in the wiki. Cyrus-imapd is not needed to be installed for the migration. Dovecot has to be stopped during mailbox migration.

Download the script and make it executable (!!! SECURITY WARNING, carefully check the script as it is from an external source !!!)

cd /root/bin
wget 'https://github.com/a-schild/cyrus2dovecot/raw/master/cyrus2dovecot'
chmod +x cyrus2dovecot

create a script /root/bin/convert-mailboxes.sh to convert each user mailbox

#!/bin/sh
  
in=/var/spool/imap/user         # Cyrus INBOXes.
db=/var/lib/imap/user/?         # Cyrus seen/subscription files.
log=/tmp/conversion.log         # Log of successful conversions.
err=/tmp/error.log              # Log of conversion errors.
quota=2147483648                # 2 GiB quota (for maildirsize).

for u in `find $in/. \! -name . -prune -exec basename \{\} \;`
do
  out=$(eval echo ~$u)
  group=$(id -gn $u)
  cyrus2dovecot --cyrus-inbox $in/$u                \
                --cyrus-seen $db/$u.seen            \
                --cyrus-sub $db/$u.sub              \
                --default-quota $quota              \
                --edit-foldernames 's/^\./.INBOX./' \
                --dovecot-inbox $out/Maildir        \
                $u 2>&1 >>$log | tee -a $err >&2
  find $out/Maildir -type d -exec chown $u.$group {} \;
  find $out/Maildir -type d -exec chmod 755 {} \;
  find $out/Maildir -type f -exec chown $u.$group {} \;
  find $out/Maildir -type f -exec chmod 600 {} \;
done

make it executable and run it

chmod +x convert-mailboxes.sh
convert-mailboxes.sh

Allow login without SSL to be compatible with old cyrus-imapd  setup. For stronger security skip this step, but clients may complain they get authentication failures when try to connect to imap/pop3
edit file /etc/dovecot/conf.d/10-auth.conf

disable_plaintext_auth = no
auth_mechanisms = plain login

change and enable the SSL settings for dovecot in file /etc/dovecot/conf.d/10-ssl.conf

ssl=yes
ssl_cert = </etc/ssl/servercerts/servercert.pem
ssl_key = </etc/ssl/servercerts/serverkey.pem

enable and start dovecot :

systemctl enable dovecot.service
systemctl start dovecot.service

After successful migration and dovecot configuration change postfix to deliver email via dovecot by editing file /etc/postfix/main.cf

mailbox_command = /usr/lib/dovecot/deliver
mailbox_transport =

systemctl restart postfix.service

If any help is needed for the migration please contact SUSE Consulting or perhaps use the community supported version of cyrus-imapd from PackageHub instead :

SUSEConnect --list-extensions | grep "PackageHub" | cut -dp -f2- | xargs SUSEConnect -p
zypper in cyrus-imapd 
cp /etc/imapd.rpmsave /etc/imapd.conf 
systemctl daemon-reload 
systemctl enable cyrus 
systemctl start cyrus