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SPAM E-mail  |  Security  |  Virus

Security Information / SPAM E-mail

SPAM (Unsolicited E-mail)

Rakuten Broadband Premium has implemented a filtration system that severely restricts the influx of SPAM that targets gol.com E-mail addresses. The spectrum of filters (if properly utilized) will automatically reject up to 90% of all unsolicited mail and requires only minimal interaction from the user.

< Standard SPAM Filtering Service >

A standard (and free) feature of the mail system available to all customers. Users may configure the filters to their liking including such criteria as language encoding, local blacklists, and public real-time blacklists. No registration is required and changes can be made from the Member's Station page.


< Advanced SPAM Filter Service >

Rakuten Broadband Premium also provides an additional, more complex SPAM filtering service for those customers that, despite using the standard filtering service, continue to receive sizeable amounts of SPAM. For a small monthly fee and a one time registration, customers gain access to our implementation of a well-received tool called "SPAM Assassin". Customers can freely adjust the level of strictness to meet individual requirements. A complete overview and instructions for use can be found on the official service page.


< Greylist >

The Greylist filter is intended as a powerful last wall of defense against cleverly designed SPAM that sneaks by other filters. Incoming mail that seems suspicious is put into a temporary holding queue. Such mail will be stored on the server (24 hours maximum) awaiting confirmation from the sender's remote mail server. If the mail is confirmed legitimate within that time, an entry will be added to the Whitelist (to ensure that all future mail from that sender will be let through unobstructed) and then delivered to your inbox. What this means is that mail that is caught by the Greylist filter may be delayed in reaching your inbox by a few hours but this occurs only once and the sender will not be aware that any delay has occurred.


< SES (Signed Envelope Sender)>

NDN: Non-Delivery Notification. "E-mail that is returned to the sender due to undeliverability." Non-Delivery Notifications (A.K.A "bounces" ) that appear in your inbox due to remote mail systems incorrectly interpreting (and returning) undeliverable mail is known as "backscatter". The SES authenticity routine checks all such incoming mails for a GOL-specific "signature" (which is inserted into all outgoing mail sent though the GOL SMTP server) to judge weather the mail actually originated from your account or not. Only E-mail with the presence of the signature confirmed is allowed in.