This does raise some concern with me.
IP '' HELO '' SENDER 'barb(_at_)gustav(_dot_)hydrospa(_dot_)com'
Testing record for gustav.hydrospa.com (probably )
Calling: /usr/local/bin/spfquery -ip=
-sender=barb(_at_)gustav(_dot_)hydrospa(_dot_)com
Response:
spfquery (reference implementation) says:
PHP spf1_parser says:
Received-SPF: unknown (no rule found)
I would certainly like to prevent people from sending mail from a non-existant
subdomain of mine. With my v=spf1 mx -all record this should fail by default.