Not that you mentioned it, but SpamAssassin seems to be the limiting factor. I use a 1Gbyte VPS with another gig of VM to make sure it doesn't crash.
Original Message From: Maurizio Caloro Sent: Friday, February 3, 2017 4:32 PM To: postfix-users@postfix.org Subject: Postfix, Dovecot, Memory ? Hello together if i will run Debian, Postfix + Dovecot on a VPS Machine what i need about memeory that this application can run without any Problem, 256Mb are not enough? - possibilities are 10 Mailboxes. exist here any experiences ? Regards Mauri