Australian Spam Act and Email Signatures

Australia's Spam Act 2003 governs commercial electronic messages, which include email whose purpose is to offer, advertise, or promote goods, services, or business opportunities. Such messages must be sent with consent, express or inferred, must clearly identify the individual or organization that authorized the message and include accurate information on how to contact them, and must contain a functional unsubscribe facility. The Australian Communications and Media Authority enforces it and has issued significant penalties. Everyday business correspondence is not usually a commercial message, but a signature can tip the balance: a promotional banner or special offer added to every email gives routine messages a commercial purpose. The identification requirement is where the signature helps directly, since a signature with the business's name, contact details, and Australian Business Number gives recipients what the Act expects. Many Australian businesses show their ABN in the signature regardless, because it is expected on invoices and widely used to verify a business. Organizations that run banner campaigns to Australian contacts should treat those campaigns as marketing, with consent and opt-out handled appropriately.