Your Profile page within your BombBomb account has contact information included for compliance with the CAN-SPAM Act. This contact information is included in the footer of your emails.
According to CAN-SPAM, "Your message must include your valid physical postal address. This can be your current personal or business street address, a post office box you’ve registered with the U.S. Postal Service, or a private mailbox you’ve registered with a commercial mail receiving agency established under Postal Service regulations."
For more on the CAN-SPAM Act see the Bureau of Consumer Protection's "CAN-SPAM Act: A Compliance Guide for Business"