[gentoo-user] OT: encrypt with smime.p7s

[Qiangning Hong]

I received an email from one of my work partners with a attachment named 
smime.p7s.  He want me to reply an encrypted letter using this public 
key.  I have no certificates currently and thunderbird disallow me to 
use the "Security/Encrypt This Message" option of the compose window. 
Do I really need a certificate?  I was thinking the other's public key 
ought to be sufficient.

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