A lot of agents at my company are receiving emails that still include the Barracuda (spam firewall) header (even in "message" view, not "source" view) and are encoded in Base64.
They are being sent from overseas for the most part, so is it possible that the locales are conflicting? ie. if there's an Asian character being sent over that necessitates the Base64 encoding in the first place.
Our mail server is SmarterMail Enterprise 14.5 and Intermedia Exchange, Barracuda Firmware v7.1.1.003 (2015-09-28 16:36:19)
So most of the header is still hidden from the user, but emails still shouldn't appear like this.
What I suspect is causing the problem is the following:
Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64
Is this a locale/encoding issue confusing our spam firewall?