Don't send encrypted messages to random users to test your gpg

Marcus Brinkmann marcus.brinkmann at
Mon May 29 15:18:18 CEST 2017

For people who want to communicate with other people rather than bots,
there is also this:

On 05/29/2017 01:00 PM, Duane Whitty wrote:
> Hi list,
> When I checked my email this morning I had an encrypted message from
> someone I didn't know and had never heard of signed with a signature for
> which no public key was available.
> When I saw the email with a subject "test, test, hello" (or something to
> that effect" I decided not to let Thunderbird/Enigmail process it but
> rather I copy and pasted the cypher text into a file and used the
> command line to look at it..
> The message and relevant gpg output was:
> "Subject: test, test - hello
> hey, i hope you don't mind - I just wanted to test using GPG and I
> picked you at random."
> gpg: Signature made Mon 29 May 2017 02:59:23 AM ADT
> gpg:                using RSA key (deleting for email to list)
> gpg: Can't check signature: No public key"
> To the person who sent me this my reply is that yes I do mind.  I tend
> to believe no harm is intended and I'm not terribly upset over it but I
> consider it to be bad Internet etiquette.  It would be only a little
> more acceptable if you had published your public key so that the
> signature you used to sign with could at least be verified.
> Having hashed that out welcome to the community :-)
> To test your setup try this link,
> I haven't used it myself but unless someone from the list knows why it
> shouldn't be used it should fine.
> I also highly recommend reading
> The above links are just to get started.  Happy pgp'ing
> Best Regards,
> Duane
> _______________________________________________
> Gnupg-users mailing list
> Gnupg-users at

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