Well, the Comcast issue is resolved. First tried marking all messages from NWFA as "not spam" but that didn't work....the Comcast spam filters still snagged them, but no other "spam".
So I just completely turned off the Comcast spam filters and that did the trick...I am getting messages again from NWFA.
Very odd to me that until a few days ago everything from NWFA was getting through just fine, then suddenly it wasn't. Very odd, too, that Comcast spam filters let an assortment of spam come through but was snagging email only from NWFA, and very odd, also, that I never turned on the spam filter on my Comcast email preferences page, yet it was on.
Thanks everyone for the help and suggestions!
Yeah GREAT! Seems we don't even have the option to "Allow" mail from NFA on the spam filter with comcast. Heelava system they've got there isn't it? I just got in there this morning and shut it off, let's see now what kind of carp will start pouring in.