Setting Up a Signature in Apple Mail
For your convenience, you can include a signature that is automatically added to all outgoing messages. A signature usually includes your name and contact information. To add a signature:
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Go to Mail > Preferences…
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Click the Signatures tab.

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Select your BC email account (it may be named differently that what is shown in the example below).

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Click the + at the bottom of the second column.

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Type a name for your signature in the second column.

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Type your signature in the third column.

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Select your signature from the Choose Signature menu.

Your signature will now appear on all new messages you create, and on replies and forwarded messages.