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I've received such a few such emails from one single person recently: Thunderbird and the web mail displays normal texts (real contents of the email), but when I click the "view source code" button, only a long string is there in the content part (no obvious real contents!), after the email headers. The style of the long string is similar to a PGP key in ASCII, but no PGP is used in the emails. The sender's mail agent is Outlook.
What is happening here? Is there a special format used here?
Do you use any OpenPGP product? It looks like the message might have been encrypted to you. Please post the email payload (the part after the email headers) with a small excerpt of the contents. – dr01 – 2016-03-07T09:00:43.467
@dr01 I've added a snippet. I use GPG locally, but I'm not using it on the Webmail, which can also display the contents. – xuhdev – 2016-03-07T09:37:56.257
@dr01 I removed the contents; I saw it's base64 encoding. Thanks! – xuhdev – 2016-03-07T09:43:38.367