Looking at your SPF record, it would appear that it's mostly functional,
although your mx mechanism is specified wrong as there are no mx records
for mail.salleboise.com. Instead, it probably should read:
v=spf1 mx:salleboise.com ip4:71.36.27.213 -all
Now, since currently the only MX record for salleboise.com is the same
as that IP address, it would be slightly preferable to swap them to
avoid a DNS lookup that's otherwise unnecessary, leaving the mx
mechanism as a backup:
v=spf1 ip4:71.36.27.213 mx:salleboise.com -all
Given that, if I were to receive mail from user(_at_)salleboise(_dot_)com coming
from IP address 71.36.27.213, my MTA would return "Pass" for it.
It's possible that you sent your failing message to a mailing list that
then forwarded your message from the original address, but now on a
different server, thus the IP address wouldn't match your SPF record.
--Marc
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