Spf smtp status fail all MTA option

SPF MTA options: (2, 4, or 5)
The  MTA  option controls whether SPF Fail "all" results are ignored (considered as successes), interpreted as temporary failures, or (the default) interpreted as permanent failures, with values of 2, 4, or (the default) 5, respectively, controlling this. (To emphasize, this option is controlling the interpretation of SPF lookups that succeeded in finding a relevant SPF record in the DNS and where the SPF record specified an explicit Fail for all subdomains of some domain name where the domain name being checked matched; for interpretation of SPF lookups that find a relevant SPF record for the exact domain name being checked, see instead the  MTA option; and for interpretation of DNS-level errors in the SPF lookup attempt, see instead the    MTA option.)

See also:
 * SPF MTA options
 * spf_smtp_status_fail_all MTA Option
 * spf_smtp_status_permerror MTA Option