Storage
Extra 2
To extend the possibilities you have with virtual Identity, you can store some additional attributes alongside the used identity. All these settings are like de/selecting features in the message-compose dialog. All storage-extras are [off by default]
If - while sending - the currently stored id does not contain this extra value, and matches otherwise, there will be no update of the stored value. If a dedicated value is stored, it must match and will trigger some warning dialog about identity mismatches while sending.
You can store the SMIME security settings for your recipients. Be aware that SMIME requires a configured certificate for the currently used base identity - you might get asked to configure one.
If the enigmail extension is installed, you can store and reuse you GPG/PGP encryption settings related to your recipients. Be aware that GPG/PGP requires a configured key for the currently used base identity - you might get asked to configure one.