This file is indexed.

/usr/share/debbugs/templates/en_US/mail/process_no_bug_number.tmpl is in debbugs-web 2.6.0.

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The actual contents of the file can be viewed below.

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You sent a message to the {$config{project}} {$config{bug}} tracking system old-style
{$markaswhat} address ({$receivedat}),
without a recognisable $gBug number in the Subject.
Your message has been filed under junk but otherwise ignored.

If you don't know what I'm talking about then probably either:

You unwittingly sent a message to {$receivedat}
because you replied to all recipients of the message a developer used
to mark a {$config{bug}} as {$markaswhat} and you modified the Subject.  In this case,
please do not be alarmed.  To avoid confusion do not do it again, but
there is no need to apologise or mail anyone asking for an explanation.

-or-

{include('mail/serious_mail_misconfiguration')}

Your message was dated {$date} and had
message-id {$messageid}
and subject {$subject}.

If you need any assistance or explanation please contact {$config{maintainer_email}}.