Alternate email address for Adobe Sign

I setup my Adobe account with my main business email address. When I send a PDF document to others for signing (Adobe Sign), the email they receive shows that business email address as the sender.

I use Acrobat DC for more than one project and need to send documents for signing from more than one email address. I only have one Adobe account and cannot justify paying for several. How can I change the sender's address to one of two alternate addresses when sending documents for signing?

Regards,

JP