-# It is rather difficult to properly test spf. We use libspf2 to do the work, and it
-# does the DNS lookups, so we cannot intercept them in the testsuite's usual fashion
-# to provide values for testcases.
+# The 127.0.0.1 source addr seems to be a builtin in the spf library; no dns lookup is done.
+# HOSTIPV4 does get a series of lookups (see server debug output to verify that).