So far, every message I've got had the text. I'm not sure if the message I've returned got through because I've not seen any replies ( when expected ).
I believe it is a good idea to note such things as the mail reader one is using and noting the sender. This may help in pinning down what the issue is. I'm using a chromebook and the default reader.
I notice that often times, the sender or receiver has a low count of post. One wonders if it is related to some spam filtering or such.
Dwight