[R6RS] Ensuring progress

[R. Kent Dybvig]

> This is not necessary.  The archive contains an obfuscated email
> address (it replaces @ by " at ").  This is also done on the other
> email addresses (from and to fields) so there is no gain in refraining
> from using email addresses in the body of the message.

I meant we should disguise them in the archive, not in our posts.  I'm
glad to hear that the archive software does it automatically.