One of AH's biggest problems with play be mail was how to generate random numbers. They came up with sporting events, or stock prices, etc for the next day. The first problem is to get hex numbers for the map - newer games have these on them, older ones like Afrika Korps, Guadalcanal, etc needed some help. AH also came up with PBM kits, I never knew the contents of these, but they would have to involve each counter (with unique ID) and a hex location. This is easily done these days with a spreadsheet. I found a website that will roll dice for you and email the results (to your opponent, and maybe both of you), this will be very handy:
http://www.rpglibrary.org/software/securedice/
It also happens to be open source.
I would suggest, if playing these games by email you take the spreadsheet for the game and print it to PDF using, say, CutePDF:
http://www.cutepdf.com/
That way there can be no arguments about the spreadsheet getting accidentally changed by either player. Just name the PDF the side you are p-laying and the turn number and they should stack in a folder in order for later reference.
If any one wants to make a stab at PBEM spreadsheet templates, I'll be happy to post them on the site for free download.
Games like Machiavelli or Diplomacy can easily be played by email and a website where a game master can post the game map by turn with each players counters shown on it. A little finesse with photoshop and FTP and its no problem. The reference CD's we provide here have all the necessary images on them to do it.
