I can't stop encryption being done with a wrong key

Anne Wilson cannewilson at googlemail.com
Fri May 27 17:19:25 CEST 2011

On Friday 27 May 2011 07:10:58 Andreas Heinlein wrote:
> Am 26.05.2011 21:26, schrieb Charly Avital:
> > In Thunderbird, key usage is set in 'Per Recipient rules', that is not
> > the Address Book.
> > 
> >> > Can someone please explain to me how this could be happening, and what
> >> > I need to do to correct it?  Should I remove his old key from my
> >> > keyring?  If I do, I assume that I won't be able to read his older
> >> > messages.
> > 
> > You don't have to remove his "old" public key from your keyring.
> > 
> > You have to edit "Per Recipient Rules" so that your friend's new public
> > key (in your public keyring) is linked to his User ID (e-mail address),
> > and used to encrypt to him.
> Thunderbird (or the enigmail extension you're most likely speaking of)
> uses the mail addresses on the keys UID to choose which key to use. If
> there is more than one key with the same mail address on the keyring,
> engimails behaviour becomes somewhat unpredictable and sometimes chooses
> the old key, sometimes the new one.
> You could either override it with explicit recipient rules, or remove
> the old key from the keyring. Since you said the old key became
> "corrupt", I see no point in keeping it anyway.
I eventually found where I could disable the key both in Thunderbird and in 
KMail, so all is now well.

Thanks to all who answered.

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