Due to a problem in the javax.mail library used in LibreClinica sending emails does not work with openjdk 11.0.16+. Up to 11.0.8 it works. A workaround is not to update OpenJDK for the moment (or to downgrade if it was already updated automatically). The community is working on a solution. A hotfix is to download the current release 1.6.2 of JavaMail javax.mail-1.6.2.jar, copy it in the WEB-INF/lib folder of the deployed application, deleting the old version mail-1.4.2.jar.
If you need further support, please consider libreclinica.org/support.html.
23-Nov-2022 Issue is resolved by the release of LibreClinica 1.2.1