A bit later, response of test with http://www.kitterman.com/spf/validate.html :
All seems ok now, but advises are always welcome, if any.
Code:
Found v=spf1 record for sentora.org:
v=spf1 mx a ip6:2001:41d0:52:a00::dd6 a:mail1.supared.com include:spf.mailjet.com ~all
evaluating...
SPF record passed validation test with pySPF (Python SPF library)!
All seems ok now, but advises are always welcome, if any.