Yes, a valid physical postal address is required. A sender of commercial email can include an accurately registered post office box or private mailbox established under United States Postal Service regulations to satisfy the requirement that a commercial email display a valid physical postal address.

Yes, the same information disclosure requirements apply to business email as to physical business letters. Companies registered or operating in the EU need to state their company details on every electronic business communication sent from their organization. Business email messages sent by a company should include:

• The full name of the company and its legal form
• The place of registration of the company
• The registration number
• The address of the registered office
• The VAT number

A valid return address must be always provided.

Yes, a valid postal address, where the sender can be reached by the recipient, must be provided. When it is not practical to include this information in the body of the message, then a clear and prominent link to a web page containing this information is an acceptable practice.

15 USC Ch. 103 - The CAN-SPAM Act
http://www.gpo.gov/fdsys/granule/USCODE-2011-title15/USCODE-2011-title15-chap103

16 CFR Part 316 - Definitions and Implementation Under the CAN-SPAM Act; Final Rule
http://www.ftc.gov/policy/federal-register-notices/definitions-and-implementation-under-can-spam-act-16-cfr-part-316

FTC Approves New Rule Provision Under The CAN-SPAM Act
http://www.ftc.gov/opa/2008/05/canspam.shtm

The CAN-SPAM Act on Wikipedia
http://en.wikipedia.org/wiki/CAN-SPAM

Directive 2002/58/EC (Directive on Privacy and Electronic Communications)
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32002L0058:EN:HTML

Directive 2003/58/EC
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32003L0058:EN:HTML

Amending Council Directive 68/151/EEC
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31968L0151:EN:HTML

Directive on Privacy and Electronic Communications on Wikipedia
http://en.wikipedia.org/wiki/Directive_on_Privacy_and_Electronic_Communications

CASL S.C. 2010, c. 23
http://laws-lois.justice.gc.ca/eng/acts/E-1.6/index.html

Canada's Anti-Spam Legislation
http://fightspam.gc.ca/eic/site/030.nsf/eng/home

Canada's Anti-Spam Legislation - FAQ
http://fightspam.gc.ca/eic/site/030.nsf/eng/h_00050.html

Canada's Anti-Spam Legislation on Wikipedia
http://en.wikipedia.org/wiki/Fighting_Internet_and_Wireless_Spam_Act