Hello,
If your courier imap servers are experiencing timeouts, like most other troubles a good place to start is checking your logs :
imapd: 60 maximum active connections.
The config line to update is :
MAXDAEMONS=60
In this example I increased to MAXDAEMONS=90
Check your logs to make sure the error goes away and that there are not so many connections allowed that it slows down your service.
If your courier imap servers are experiencing timeouts, like most other troubles a good place to start is checking your logs :
imapd: 60 maximum active connections.
The config line to update is :
MAXDAEMONS=60
In this example I increased to MAXDAEMONS=90
Check your logs to make sure the error goes away and that there are not so many connections allowed that it slows down your service.