Hello there,
ESA 13.5.1 does not longer offer support for SSL v2 and SSL v3.
As per release notes:
SSL Configuration Changes
The following are the new changes made to SSL configuration settings:
- There is no support for SSLv2 and SSL v3 methods
The workaround is to ask senders to enable newer versions of the TLS protocol, preferably TLS 1.2
Reference: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-release-notes-list.html
Let me know if you have any questions.
Cheers.
José L. Dávila