Once your Yahoo! Mail Classic signature is set up, you are certainly eager to use it. Normally, you'll append it to all outgoing messages. Fortunately, Yahoo! Mail Classic can do that for you automatically.

Automatically Add Your Signature to Yahoo! Mail Classic Emails

To add your signature to outgoing Yahoo! Mail Classic messages automatically:

• Select Mail Options from the Yahoo! Mail Classic navigation bar.

• Follow the Signature link.
• Make sure Add signature to all outgoing messages (below the text of your signature) is selected.
• Click Save.

Yahoo! Mail Classic will now append your signature by default, but you can override this setting for individual messages by un-checking Use my signature on the message composition screen.