-To discourage phishing, web bugs (tracking), viruses and other nuisances,
-only plain-text content is allowed and non-text content is stripped.
-This saves I/O bandwidth and storage, which is important as
-entire mail archives are shared between clients.
+
+To discourage phishing, trackers, exploits and other nuisances,
+only plain-text emails are allowed and HTML is rejected by default.
+This improves accessibility, and saves bandwidth and storage
+as mail is archived forever.