I am currently trying to secure my qmail installation and the SMTP connections.
When compiling the standard UCSPI SSL, all supported ciphers are enabled by default. This leads to problems with POODLE, heartblead and other SSL problems.
I set an environment variable called CIPHERS with the following values.
CIPHERS=ALL:!LOW:!SSLv2:!EXP:!aNULL:!eNULL!3DES:!MD5:!EXP:!CBC:!PSK:!SRP:!DSS:!RC4
This disables most of the "not so nice" stuff except of SSLv3 which is responsible for POODLE.
The second I set
CIPHERS=ALL:!LOW:!SSLv2:!SSLv3:!EXP:!aNULL:!eNULL!3DES:!MD5:!EXP:!CBC:!PSK:!SRP:!DSS:!RC4
the server stops working.
Any advice is welcome also for Ciphers that I may should disable on top.