To set your account to automatically attach your contact information (in vcard format) to all outbound email:
1. Click on the Preferences menu located in the upper right hand of your account. The preferences window will open
2. Click General Settings under the Email heading
3. Under the Compose Email heading, set the Automatically attach contact info dropdown to attach the appropriate information to your emails.
You may choose between None, Work Information, Personal Information, All Information.
4. Click Save located in the top left corner of the preferences window