Exclude some attachment types when receiving issues by email
Currently, Redmine adds all the attachments of an email reporting/commenting on an issue to that issue. This includes automatic attachments such as VCards or cryptographic signatures, which are not relevant to the issue.
It would be good if the email-reception system allowed to specify a list of blacklisted MIME types.
From my example above a good default should contain
application/pgp-signature application/pkcs7-mime text/x-vcard
(This is from the top of my head; There might be others.)