Thanks! And good that Google at least likely deals with it ok. Just as a general thing it is a good idea to be very careful about replay possibilities and I th

Thanks! And good that Google at least likely deals with it ok. Just as a general thing it is a good idea to be very careful about replay possibilities and I think you are a bit too casually dismissive. Not every provider stores email forever (although storing just the DKIM signature could be done without too much trouble) and there are circumstances where receiving the same message as previously to a cleared inbox might not be an obvious duplicate if you don't happen to look at the date (which is not something I usually do when looking at email). Of course, this is already a potential issue today.