[Dovecot] max_mail_processes

[Tony Tsang]

Hello,

I have some doubts about max_mail_process option on dovecot.conf. When
I set to 3, only 2 clients can be logged in at the same time. when I
set it to 2, only 1 clients can be logged in. Why is the maximum
number of concurrent clients is always 1 less than max_mail_process?
Is any other process is also counted as mail_process other than imap
and pop3?

Tony