Fife and Drum Webring wrote:
Without a valid SPF record, the "From" is likely a spoofed address
and will get flagged as spam (and possibly just discarded once SPF
usage becomes widespread by the major ISPs).
I hope that those who check for SPF will distinguish between a failed
check for a domain that has published SPF data, and a failed check for a
domain that has no SPF record.
Discarding or bouncing messages from domains without SPF records would
create chaos, at least in the forseeable future.
/ Gunnar