The @mention-Function was used to work on our installation. Some weeks ago user informed us (the administrators) that the function obviously doesn't work properly any more. When you start typing a user's name in the edit page-mode the pull down menu appears an it's still possible to select a user who should receive an E-Mail. The result is, that no message is sent. The system itself (Confluence) can still send E-Mails, e.g. the share-function sends E-Mails which can be watched in the mail log.
We tried to deactivate/re-activate the mentions-plugins and deactivated all user-installed plugins with no success. Do you have any suggestions?
The log files atlassian-confluence.log and catalina.out show no error messages or hint what could be the reason.