I started a thread that doesn’t seem to be getting much attention regarding this same issue. I didn’t post here because the original post was made 9+ months ago. My problem seems to be directly related to version 2.2. I have just started 4 blogs, I installed 2 on Saturday and 2 on Sunday. I just happened to notice that the Fantastico installation was upgraded overnight on Saturday into Sunday.
I tried and tried to get the post by e-mail to work on 2.2, but then remembered that the blogs I had installed on Saturday were 2.1.3. I tried getting post by email to work on 2.1.3 and it worked on my first try. Thinking it was just a coincidence, I tried the other install of 2.1.3 and it worked too. I went back and tried the other 2.2 and it didn’t work.
Seems awfully strange that the problem I’m experiencing appears to be in 2.2 only. Of course, YMMV, but it seems like a pattern to me.