2 of my systems are quite busy (about 10000 email accounts & many Office 365 connections) with permanently high number of processes (500-600) the system load is still ok but it's increase very quickly when there is a lot of traffic via Apache and at the same time too many Dovecot mysql querys ...
Is there any way to completely outsource the mailserver including database for Dovecot, Roundcube etc. using the listener files?
How does an external installation work and what is needed?
Do all customers in the panel have to be switched to external MX and do they all need an MX entry set in IMSCP DNS (I use external nameservers PDNS)?
Do I have to completely install IMSCP on the external system or which packages do I have to install?
I guess the hostname would then probably also have to be changed?
Can anyone share some details on how to outsource the mail server with IMSCP?