A 26-year-old disc jockey (DJ) was questioned by city Crime Branch after his unsecured WiFi connection was hacked into to send an Indian Mujahideen terror email following the Varanasi blast, but was let off today.

Akhil Talreja, a resident of Vashi in adjoining Navi Mumbai, says he had learnt right lessons from the incident and will never leave his connection unprotected again.

"I was told some terror outfit used it to send an e-mail after the Varanasi blast (yesterday). I was shocked and shaken. I was questioned for at least 30 minutes last night," he told PTI.

"Today also I was taken to Crime Branch office in Mumbai and same questions were repeated. The questioning lasted for a few hours," said the DJ, who has done remix of several many Bollywood songs.

Talreja said he had learnt lessons from the "bad" experience. "Everyone should know how to secure their Internet connections. I will never leave my WiFi unprotected again."

Indian Mujahideen (IM), the outfit which purportedly sent the email to media houses claiming responsibility for the blast, had hacked into WiFi of Talreja.

Police said the logger of the router has been disabled so there was no trace of who logged and hacked it. The email ID used was from Gmail and the mail was written on December 6.

The account has been accessed rarely, police sources said.

The IM had been using unsecured WiFi connections for sending mails to media houses within minutes of blasts.