PHP Helpdesk recommendation? (OSS or commercial/hosted)

Hi all,

I've tried a few PHP helpdesk systems, but none match quite my needs.
Can anyone make a recommendation?

Features essential:

- ability for members of the public to email a helpdesk email, which
automatically logs a support query
- must not require (or even ask) members of the public to create and
account on the system. We want to refer to the subjects purely by
their own email address - not name, account, or anything else.
- ability to refer ticket to other helpdesk administrators

Features desired:

- ability for tickets to be created from a web page, *without* the
user creating a support account
- ability to take notes on a query that aren't visible to the member
of the public

Anyone know anything suitable?

Many thanks!

Joe
.

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