It would be really nice to be able to perform  
commands through the email gateway:  
  
- help  
- list issue  
- show issue167  
- search issue title="some text to search  
for"  
  
... are there any others?  
  
We can check the body of incoming messages  
that have a blank subject - if they contain  
_only_ the command text (ignoring signature)  
then run the command.  
  
While we're at it, the help page returned by  
the mailgw could use work.  
  
There's a chance that some email programs  
will auto-set a blank subject to "no subject"  
(hello, outlook) so maybe the check could be  
performed even when there's a subject, but no  
[designator] on the subject line.