Yes, mail_nxd supports TLS 1.2 if the Java version being used supports TLS 1.2

To configure mail_nxd to use TLS 1.2:

1. Ensure Java version being used to run mail_nxd supports TLS 1.2

2. Add the following argument to the command which runs mail_nxd: -Djdk.tls.client.protocols="TLSv1.2"

This can be done in NX_ROOT/pdmconf/pdm_startup.i, command line section, under: #define PDM_MAIL_NXD(_TAG, _HOST), save changes and restart services.

Example: