I think if that was a feature, it would pretty much be malpractice? Arbitrary manipulation of key assignments is not specifically allowed in RFC 4880 (openPGP's), although it is possible to transfer public keys to different user packets.

The easiest and most consistent way for you to achieve this would be, I think, to duplicate a...@b.org's entry in your GPG keychain by assigning to a new ID c...@d.org the same public key as a...@b.org.

11.1 Transferable Public Keys
[....]
Each of the following User ID
packets provides the identity of the owner of this public key.  If
there are multiple User ID packets, this corresponds to multiple
means of identifying the same unique individual user; for example, a
user may have more than one email address, and construct a User ID
for each one.

That said, I am not an expert on openPGP compliance. :-)

--
Luca Allodi - University of Trento, Italy
web: http://disi.unitn.it/~allodi (@secscientist)
Visiting Durham University. Durham, UK.

On 17 Jun 2014, at 14:43, Niels Kobschätzki wrote:

Hi,

I want to send a mail to someone who has two addresses: a...@b.org and c...@d.net (just examples). I have a public key for a...@b.org and want to send an encrypted mail with this key to c...@d.net. How do I do this with Mailmate. I know that it is usually possible with GPG, but how to do it in Mailmate?

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