On Tue, 19 Nov 2019, Merrick wrote:
The question is, how to make storage shared by two MX servers?
MX (SMTP) servers don't store messages. They deliver them to whatever system makes them available to the users.
(or do you mean you want have a shared queue? -- not recommended!)
The messages should be stored in one place, such as webmail/IMAP could read all messages directly from this location.
Use a single IMAP server. Have both mail servers deliver the messages to the single IMAP server.
