In reply to mypyrex:
Assuming the .com isn't a standard mail site (googlemail, gmail, hotmail, fastmail, etc) go to it and see what's on the site. If it's a generic site unrelated to him and the guidework he does perhaps you should be wary.
If it bothers you going to the site link it here and I'll take a look.
Might also want to check his previous emails that you have, does the text look the same? Like many who speak english as a second language he uses a decent amount of punctuation without spaces before he starts typing again like,this, is that shown in his previous emails? Most scams don't put that much effort into reproducing text the way the owner of the account does.