PBEM Issue - No Password?

[Compass Rose]

Just got going with my first PBEM game and my opponent generated and sent me the first file.  Was able to get it loaded in but surprisingly I was never prompted to generate a password at any point prior to the completion of my turn.  

After I was prompted the file was ready to email back to my opponent, I decided to load up that file to see what would happen.  As suspected the file was poised for my opponents turn and it didn't ask for a password to be put in to proceed.  I could tell the next step was going to reveal the map from my opponents perspective and I thankfully was able to shut the game down without seeing anything. 

I am running Salerno 43 v3.00 and I assume my opponent has the same version since he just got it during the summer sale.  Could a disparity in versions cause this?  I tried searching the forums for this issue and nothing came up so it seems this is a very unique problem that has cropped up.  Any ideas of what is going on? 

-Mark

That is why I always play with email encryption turned "on" to prevent such an event from happening; sending my opponent the wrong file is not uncommon; at least now when I screw up, it doesn't cost me the whole game as now my opponent can't open my turn without the password...