Freron MailMate

If "Encrypt by default" is set to "Based on history", MailMate defaults to OpenGPG all the time, because my entire Sent folder is encrypted.

However, it is encrypted with two of my own keys, not the recipients keys, since most of them do not use PGP. I did not really send an encrypted mail to the other party, I just encrypted my own Sent folder. That also means I do not want MailMate to base its prediction based on it. I only want to use MailMate to encrypt messages when I actually have a key from the other person.

If I set "Encrypt by default" to "Never", MailMate defaults to S/MIME, which is what I want for most recipients (because that leads to S/MIME signing only).
So, I would like to stop MailMate from deciding against S/MIME and for OpenGPG when I have not actually ever sent encrypted mail to the recipient.

Two ideas on how to achieve that:

1) MailMate could check for whether it actually has the public key for the recipient before deciding to enable OpenGPG. If I do not have the public key, I am fairly unlikely to have previously sent encrypted mail to the recipient.

2) MailMate could be told to ignore specific keys, because they are mine and should not count when considering whether I send an encrypted message. Maybe another setting in Security.plist or something similar to retiredAddressPattern. Or even being very clever: checking for private keys available with GPG (well, at least for key stubs) and ignoring my own keys in the "based on history" decision.