I've got ISPConfig 3.2 with Dovecot installed on a Debian 10.7 server. I can send/receive emails normally to domains not hosted on the server but I cannot reliably send/receive emails between accounts/domains that are hosted on the same machine. Sometimes is works, sometimes it doesn't. For example: [email protected] -> [email protected], shows up in user1 sent but never shows up for user2. [email protected] -> [email protected] delivers normally. [email protected] -> anyone under mydomain, nothing is delivered [email protected] -> [email protected], nothing Edit: I've checked in spam, nothing there. In mail.info I see the following: From what I can tell, the email is delivered and sure enough if I Is my Maildir/new folder I see the message. It never actually shows up in my inbox though. My Postfix/Dovecot config is the default ISPConfig one an there are no custom filters in place. Any ideas on this?