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.  
  

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I second that email commands are an important feature
(Thus I would raise the priority.)

Apard from just listing, searching and help commands are
also needed to
actually manipulate the issue. Thus there is a need for
authenficiation.
The real solution would be to have a gnupg signature which
gets checked.
As a workaround a check on the From addresses or additional
passwords
might be feasable.

see also issue1946564 which mentions some security aspects.
Security could -- now that pgp support exists -- be solved by requiring
authenticated (pgp) email for certain actions or users.
On the other hand we now have XMLRPC so remote management can be solved
by other means.