Outlook IMAP sync

Outlook tries to keep IMAP connection on-line using the IMAP IDLE instruction. This instruction does not work as Outlook expects. As result connection hangs.

Resolution for Plesk and Plesk Premium Mail (Kolab)

1. Connect to the server via SSH
2. Plesk: Open the file /etc/dovecot/conf.d/12-plesk-idle.conf with the text editor and add the following line:
3. Kolab: Open the file /etc/dovecot/conf.d/12-kolab-idle.conf with the text editor and add the following line:

4. Note: If the file does not exist, it should be created

   imap_capability= LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
   …

5. Restart Dovecot service:

   # service dovecot restart