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: user1@mydomain -> user2@mydomain, shows up in user1 sent but never shows up for user2. user2@mydomain -> user1@mydomain delivers normally. redmine@mydomain -> anyone under mydomain, nothing is delivered user@otherdomain -> user@mydomain, 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?
Try using the RoundCube webmail client, do the emails show up there? If yes, then it#s probably related to a setting in Thunderbird, as RoundCube uses dovecot IMAP to fetch the mails as well.
Yep, everything shows up in Roundcube, which is strange since Thunderbird is configured for IMAP also.
Heads up for anyone else running into a similar problem: It was in fact Thunderbird. The issue can be fixed by going to Inbox folder properties and clicking on Repair Folder. Once I did that everything showed up. Very strange since this issue affected 5 different users with 5 different email accounts.
