I, too, have heard 'waffle' used as a verb for a very long time here in Virginia--at least, oh, thirty years. Maybe, Jackie, in Kentucky you have such a high quality of waffles, you don't permit any other meaning of the word to uproot its place!

And M.Webster's documents it as a verb here in the USA:

Main Entry: 2waffle
Function: intransitive verb
Inflected Form(s): waf·fled; waf·fling /-f(&-)li[ng]/
Etymology: frequentative of obsolete woff to yelp, of imitative origin

1 : EQUIVOCATE, VACILLATE; also : YO-YO, FLIP-FLOP
2 : to talk or write foolishly : BLATHER <can waffle... tiresomely off the point -- Times Literary Supplement>
- waf·fler /-f(&-)l&r/ noun


But why would waffling in email be so prevalent?