TITLE:
Certificate for securing mail - cannot be set to NONE
PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE:
Plesk Onyx Version 17.0.17 Update #24, CentOS Linux 7.3.1611 (Core), Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz (8 core(s))
PROBLEM DESCRIPTION:
In Tools and Settings -> SSL...