7 Jan 2019, 10:17

@externa1 @irrlicht I managed to reproduce this issue on a local machine that was upgraded from the current final. For 8.7 we introduced support of utf8mb4 to allow additional characters (see https://jira.kopano.io/browse/KC-725).

Since that database conversion can take some time, we afterwards decided to decouple this from the server start. There is still one remaining pr (not yet merged because of test failures) that will address issues like yours above, when the conversion was not yet run.

The long term “fix” is to run kopano-dbadm usmp (when kopano-server is not running) to convert your database.

PS: small details to add here: if you create a new database this will of course be created with support for utf8mb4. its just old databases that need to be updated.