On Wed, 01 Jun 2016 13:58:20 +0800, you said:
> Sorry, I mean the mail's contentĀ
> I can not read the mail, there's only a *.bin file attachedĀ
You have a defective mail reader, which is unable to recognize
a digital signature. There's been an Internet standard for that
since 1995, so there's *really* no excuse.
1847 Security Multiparts for MIME: Multipart/Signed and
Multipart/Encrypted. J. Galvin, S. Murphy, S. Crocker, N. Freed.
October 1995. (Format: TXT=23679 bytes) (Status: PROPOSED STANDARD)
(DOI: 10.17487/RFC1847)
Even if your mail reader doesn't understand how to verify a PGP
digital signature, it should at *least* tell you "This was a text
mail with a digital signature I can't handle".
It's 2016. Even Outlook figured out how to do this a decade ago.
Complain to whoever did your mail software.
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