NTT Docomo cracking down on spammers who take advantage of the company's I-mode mobile network to distribute spam e-mails to its subscribers.
The move comes in response to the growing volume of spam being sent over the I-mode network, which has 44 million subscribers.
In the past, most spam e-mails sent to subscriber handsets over the I-mode network came from personal computers, the company said, and Docomo asked I-mode users to modify their user preferences to accept e-mail only from designated domains or e-mail addresses. The company also began blocking e-mails that were sent to a large number of invalid I-mode e-mail addresses.
The spammers then changed tactics, sending e-mails from I-mode handsets rather than from PCs.
A customer complaint about spam sent from an I-mode handset will result in the temporary suspension of all I-mode services to the offending subscriber. The precise length of time for which services will be suspended was not revealed.
If the offending subscriber continues to send spam from their I-mode handset, a second customer complaint will result in a cancellation of the offender's I-mode subscription.
Sumner Lemon writes for IDG News Service