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The enviroment var, SPFBEHAVIOR needs to be set. If it is not set, 
xf-spf will not run, and will log a message stating SPFBEHAVIOR en-
viroment var is not available. SPFBEHAVIOR will define the proper 
behavior of xf-spf.

SPFBEHAVIOR enviroment may have values between 0 and 6, similar to
qmail's SPF patch. You can have a full description off all behavior
values reading the installed README file:

  %%DOCSDIR%%/README

If you want to disable xf-spf for some reason, or disable it's che-
cking for one particular IP address, using tcprules(1), set 
SPFBEHAVIOR to 0.

Configure xf-spf usage on qmail-smtpd's SMTPEXTFORK patch:

Add %%QMAIL_PREFIX%%/bin/xf-spf to the appropriated enviroment var:

  echo %%QMAIL_PREFIX%%/bin/xf-spf > /var/service/smtpd/env/SMTPEXTFORK

Or use it with tcprules:

  :allow,SMTPEXTFORK="%%QMAIL_PREFIX%%/bin/xf-spf"

Remember that more than one program can be used with SMTPEXTFORK patch.
If you already use any other, add xf-spf separated by comma:

  :allow,SMTPEXTFORK="%%QMAIL_PREFIX%%/bin/xf-spf,/some/other/prog"

Or

  echo "/some/other/prog,%%QMAIL_PREFIX%%/bin/xf-spf" \
	> /var/service/smtpd/env/SMTPEXTFORK

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