"v=spf1 mx report -all"
The current-domain is example.com.
No more than once every 24 hours, at a time of the SPF
client's choosing, a report is sent to
postmaster@example.com. The report SHOULD include a
breakdown for "fail" events by client IP, sender address,
and recipient address, with a count for each line. The
report MAY also provide a single count of "allow" responses.
The report MAY be truncated after 500KB. If no failure
events are recorded, SPF client hosts do not have to send
the report.
"v=spf1 mx report=bogus@otherdomain.com -all"
If the current-domain is example.com, the report
directive is ignored because otherdomain.com does not end in
example.com.
"v=spf1 mx report=staff@noc.example.com -all"
If the current-domain is example.com, the report
directive is respected because noc.example.com ends in
example.com.
"v=spf1 mx report=staff@example.com -all"
If the current-domain is mail.example.com, the
report directive is respected because mail.example.com ends
in example.com.