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2 changes:

* LINKTYPEMAP
* circular links are not allowed

Default is to still look in body, but if you want the module to only
look in the defined header, use Set($CommandByMailOnlyHeaders, 1);

(Based on commit 2b533dc27f6a074b96a39c66379fc150a3f51ede from pr/3.)

[Adjusted tabs — s/\t/    /g — and simplified the $only_headers
conditional. -trs]

Fixes a regression introduced by 33d02398 which caused t/create.t to
start failing (on line 88).

intention of the code is to store original value
in the results, but it was stored incorrectly, so we
end up with two records in results: first with success
and ISO date, second with value only that is treated
as failure.

This allows us to parse a configurable header for commands too, by
setting the CommandByMailHeader setting.

If the cpan shell tries to run these, they'll connect to your live
database and webserver and start making tickets by invoking mailgate

This means any data cat'ed onto a tempfile actually goes to /dev/null
We should fix this when we switch to RT::Test

RT-Authen-ExternalAuth can block user creation in the mailgate by
returning 0 from CanonicalizeUserInfo if the user doesn't exist in the
external system.  RT blindly assumes that
RT::Interface::Email::CreateUser will return a user, so it returns the
CurrentUser and 1 without checking to see if the creation was
successful.

This results in CommandByMail getting a defined but unloaded CurrentUser

Checking for the Id prevents later failures