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.

See also issue 2550731 that should allow this to be implemented as an
auditor since the auditor can look at the message and see from the
db.txSource variable added on the issue that it was authenticated
using email/pgp.

Just a note that a subject line with the work "help" will return
the help text for the mail gateway.