How to check the number of active IMAP or POP connections and set a threshold for each?

Issue

How to check the number of active IMAP or POP connections and set a threshold for the same?

Solution

For checking the current number of active IMAP or POP connections on a system, we can use the following commands.

For the current number of IMAP connections,

> stat get system.imapc

For the current number of POP connections,

> stat get system.popc

We can set a threshold to the maximum number of IMAP / POP connections currently active on the system by using following commands,

To set threshold for IMAP connections,

> mon setthresh system.imapc "number"

To set threshold for POP connections,

> mon setthresh system.popc "number"

(number = maximum number of active connections allowed on the server simultaneously)