Spf smtp status fail MTA option

SPF MTA options: (2, 4, or 5)
The  MTA option controls whether SPF Fail  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 the exact domain name being checked; for interpretation of SPF lookups that succeed in finding an explicit Fail all SPF record applying to subdomains including the 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
 * error_text_spf_fail_4 MTA Option
 * error_text_spf_fail_5 MTA Option
 * spf_smtp_status_fail_all MTA Option
 * spf_smtp_status_permerror MTA Option