[OT] Messages missing

Hi,

I do _not_ receive messages from "mike@xxxxxxxxxxxx" anymore on Gmail
!!! (but I _do_ see the responses to them). To be more specific, these
are
the last msgs from Michael Kay I received:
7 Oct: 2 msgs [saxon]
6 Oct: 2 msgs [saxon], 4 msgs 
5 Oct: 4 msgs [saxon], 1 msg 
4 Oct: 3 msgs [saxon], 1 msg 

Is this only me, or Gmail, or ??? - any clue?
Thanks in advance,
Manfred