glad the blog post helped you.
Luckly Kopano uses Postfix as the MTA (mail transport agent), too. Therefore all the other stuff in this thread still applies.
Edit: in case you’re wondering how Postfix fits into the Kopano stack: Postfix still uses direct LDAP lookups for determining which domains and email addresses to accept mail for. If the mail is considered to be local, it accepts it and hands it over to the running
kopano-dagent (delivery agent) process via the LMTP protocol. The
kopano-dagent in turn handles stuff like out-of-office replies, storing mails in public folders etc. and finally hands it over to the
kopano-server process which writes to the database.
Outgoing mail injected via ActiveSync (z-push) or via the Webapp is handled by the
kopano-spooler process. This one tries to connect to Postfix via SMTP. Postfix is then doing its usual routine of figuring out whether the mail is local or external and delivers accordingly.