It would be similar to this post:
Any reason that you don't want to upgrade to Domino 9?
There's been a lot of activity to add support for TLS 1.2 with protocols: HTTP, SMTP, LDAP, POP3 & IMAP - which are only available in the Domino 9.0.1FP7 codestream.
If you're running any websites or transferring mail via SMTP, you really should upgrade to a current version.
You may want to review the Notes/Domino 9 forum: