Everyone put in dns an SPF record for domain that designate EFA Server IP to be valid for owned domain
So receivers have this in their spamassassin results
0.001 SPF_PASS SPF: sender matches SPF record
But receivers have this message if we dont publish SPF_HELO
SPF_HELO_NONE
To publish it we must put a dns txt record like this for my server
TXT efa41.gruppocomet.it. v=spf1 a -all
This authorize SPF for any A record of the domain regarding this host name
And receivers have this :
0.001 SPF_HELO_PASS SPF: HELO matches SPF record