activate iterate_query for doveadm
This patch will activate the iterate_query to make doveadm work. I just tested it with a fresh ISPConfig install on Debian Stretch.
doveadm is a useful tool as it provides various commands like indexing (if you enable the solr full text search) or expunging old mails from the Junk folder.
Without iterate_query:
# doveadm search -A mailbox Junk
Error: User listing returned failure
doveadm: Error: Failed to iterate through some users
With iterate_query:
# doveadm search -A mailbox Junk
mailbox@server.de bd4486287ea87955960900007ce15446 3265
mailbox@server.de bd4486287ea87955960900007ce15446 3266
This is my crontab entry for expunging mails older than 4 weeks from Junk folder:
1 6 * * * root doveadm expunge -A mailbox Junk SENTBEFORE 4w && doveadm purge -A