I am using Elementary OS 0.4.1, Evolution for my gmail account. Additional, I use GPG to encrypt my emails I send to my friends.
I did a reinstall of eOS on my laptop. Please note, I kept my home folder on separate partition than root.
After reinstall, evolution is not encrypting my email, before sending email it is showing following error:

Could not create message. Because "gpg: using subkey BB84D566 instead of primary key CEF41E5C gpg: using PGP trust model gpg: This key belongs to us gpg: CC461E31: There is no assurance this key belongs to the named user gpg: [stdin]: encryption failed: Unusable public key ", you may need to select different mail options.

I have already given OpenKey Id for the account I am using.
Please help me out, thanks...

1 Answer 1


It turned out that it wasn't the fault of Evolution. I had to trust my friend's GPG keys (CC461E31) for encryption to work. This would be a solution. Another will be, and I quote from mailing list,

Configure evolution not to check that and instead assume that if you have a OpenPGP key in your keyring for a given email, it should encrypt the messages for that recipient using that key: Edit → Preferences → (Choose your account) → Edit → Security → Check Always trust keys in my keyring when encrypting

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