On Thu, 9 Jun 2022, Richard wrote:

Rather than simply upping the limit I think a reasonable question to

ask is why/how they are managing to do that. That's a lot of open

folders.

If this mail client behaves anything like Apple mail clients, these

connection storms can come about when doing global searches. The mail

clients will march through each mailbox (opening a connection for each

mailbox) looking for a pattern.

If you can narrow this scenario for one specific user (e.g. $user), you

can deep dive what's going on by enabling IMAP session logs for this user

    protocol imap {

            ...

            rawlog_dir = /log/dir/%u

    }

then

    (Make sure this user has write permissions into this directory)

    mkdir /log/dir/$user

After you're done, you can disable logging,

    rm -rf /log/dir/$user

Joseph Tam jtam.home@gmail.com