Yahoo! and Seven have entered into a licensing relationship in which Seven's Consumer Edition mobile e-mail software and related personal communications services power the recently announced Yahoo! Mail for Mobile, a new mobile e-mail service that gives consumers enhanced access to their Yahoo! Mail accounts on mass-market mobile phones and smartphones.

This Yahoo! Mail for Mobile application provides consumers with message access, composition, management, optional instant notification of new messages, offline access to messages, and access to their Yahoo! Address Book. All activities performed on the mobile phone, such as writing a message or deleting a message, are reflected in the user's Yahoo! Mail account, with full synchronisation.

The service can push new messages to a subscriber's mobile device as they arrive, delivery can be scheduled per user preferences (e.g. every 15 minutes; every hour or every day), or a user can initiate synchronization as they please.

Consumers can sign up for the service online or from their mobile phones. After downloading the Yahoo! Mail for Mobile client software over the air directly to their phone, consumers get up and running by entering their existing Yahoo! username, password and mobile phone number into their handset; no additional PC software is necessary.

Yahoo! Mail for Mobile messages are protected by 128-bit AES encryption while in transit. AES has been specified by NIST (The National Institute for Standards in Technology) as the new standard for encryption, replacing DES and 3DES. AES encryption provides strong security and privacy of messages sent and received by a mobile phone.