How to remove (spam) issues from the tracker

Hello,

I have the problem, that my issue tracker is used to track mails to an
address for a official of an association. Unfortunately some spam mails
will be sent to this account as well.

I will soon modify the mailing rules (hopefully) to separate but it will
not be possible to separate these mails completely. Mails from the
outside should go to the tracker if the content is a real issue.
I am not yet sure how manage this...

The question is: How can I remove these issues coming from external mail
sources that contain spam?
There will nobody assigned and I wanted these simply to get removed. I
can for sure unlink the message and the potential appendices from the
issue. However I do not see how to
a) Remove/retire the issue itself?
b) Tidy up the removed mail messages/files?

Thanks a lot
Christian Wolf

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