On Wed, 21 Oct 2020, David Pottage wrote:
I think there is a limit on the number of concurrent IMAP sessions that each
user can have open at once, and the default is 5 or something fairly low.
Modern smartphone IMAP clients can easily have that many sessions open, if
the user is monitoring many folders for new mail, so when the user attempts
to log in with another device they cannot because they have hit the limit.
Global searches using Apple mail readers will open as many concurrent
mailboxes as your settings allow, even hundreds. However, they're
closed in batches as well, so a graph of user mailbox connections will
show sawtooth patterns.
Joseph Tam <jtam.h...@gmail.com>
