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Starting emails with "BEGIN PGP MESSAGE" will fool the filter
Our university deployed a mail filter that rewrites URLs in emails to redirect them via a service that checks for bad websites. Somebody clever worked out that PGP-signed emails are exempt from the rewrite rule, so now people are starting their emails with "BEGIN PGP MESSAGE" even though they haven't used PGP at all, just to fool the filter 😂 Anybody sending malware links has probably also worked out that trick by now, thereby rendering the entire filter pointless
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