Storage
Extra 1
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 decide to store if you like to get any return receipt for your message or the selected character encoding and the message format (html or text) related to the recipient.
You can even store if you like to save any FCC for the sent mail - be aware that this will only work as long as you are using a virtual identity. Usual identities will use their FCC-settings for any recipient.