#65 add outbound spf

[jcbf]

No description provided.

[coveralls]

Coverage increased (+2.2%) to 89.205% when pulling 1e37ba1 on #65_outbound_spf into d99282c on master.

[codecov]

Codecov Report

Merging #66 into master will increase coverage by 2.26%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   86.81%   89.08%   +2.26%     
==========================================
  Files           1        1              
  Lines         508      522      +14     
==========================================
+ Hits          441      465      +24     
+ Misses         67       57      -10

Impacted Files	Coverage Δ
smf-spf.c	89.08% <90%> (+2.26%)	⬆️

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