Storage
Identiy
To find the right identity for any recipient you can go two ways. One way is to check any selected mail on which for instance your reply's are based on.[1] Another way is to store some identity information for any recipient you are sending some email.
The usage of this identity-storage can be globally activated here, it is [on by default]. You can also open the storage-editor from this tab.
Generally the identity for any recipient is read as soon as the recipient is entered and the address-field is left. You will probably be asked what should be done if you are already using a virtual identity.
After pressing the send-button the current identity will be saved to the recipients - recipients are stored with full name and email address exactly as shown in your address field. Later matches will only occur against complete recipient matches - if you don't like that, you can manually create related filters.
Use the other tree-items to fine-tune the storage, usually it will work without modification.
[1] These features are called 'Smart' and can be configured in the 'Source Mail' tab
