DoCoMo reports malfunction of sp-mode service

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NTT DoCoMo on Wednesday reported that its sp-mode service malfunctioned between 12:22 and 14:25 p.m. on Tuesday. Due to a problem with the communication equipment, the email addresses of some customers using the service were reset with incorrect addresses, DoCoMo said.

When some users checked their registered address, they found that the address had been changed. People who received an email from a sp-mode user saw the address of another sp-mode subscriber as the sender’s address, and if they replied, their mails were sent to that address.

DoCoMo said an interruption in a transmission line caused a disruption in the sp-mode server in the Kansai area, resulting in the server’s incorrect processing of telephone numbers and IP addresses. The disruption was recovered by implementing capacity restrictions at 14:25, but according to customer reports, thereafter it appeared that some customers experienced problems with their mail addresses being changed.

Due to the sp-mode server’s automatic self-correcting function, the problem was resolved by around 6 p.m.

As a precaution, DoCoMo has advised customers to turn their smartphones off and on one time. In addition, the company has reset related packet switching equipment as part of final efforts to fully resolve the problem.