Lots of old messages today

Do you mean old replies to threads you started or conversations? Did you receive them before (i.e. are they repeats) or are they 'delayed' messages? My personal email went all slow yesterday PM and then suddenly caught up in a rush - so it seems some ISPs have been experiencing routing issues.
Rob...just picked up on this post...I was receiving e-mail updates the last couple of days from RPF instead of almost immediately...I just assumed (maybe wrongly) that it was an issue with Apple Mail...

It seems to have corrected itself now.