We’ve completed sending out notifications to all affected users of Friday’s exploit. Email notifications started going out at 19:31 on the 25th of January at a rate of 1 per second and finished at 18:32 on the 26th of January.
There were 81,205 email addresses included in the exploited data – of those, 598 were exact duplicates. We therefore tried sending to 79,809 different addresses (we didn’t filter the list any further at this point as we just wanted people to be notified as quickly as possible).
After the emails were sent, we did analyse the data and found:
* 12 email addresses did not actually have a valid domain name structure
* 2,906 email addresses were sent to domains which cannot receive email (such as no longer being registered)
* 14,427 email addresses were actually duplicates (such as gmail.com and googlemail.com, e.x.a.mple@gmail.com and example@gmail.com and test+123@example.com and test@example.com)
* 31,582 email addresses were on “common domains” (defined as gmail.com, aol.com, aol.co.uk, hotmail.com, hotmail.co.uk, yahoo.com, yahoo.co.uk, outlook.com, aol.co.uk, btinternet.com, fastmail.fm, wanadoo.fr, bbc.co.uk, mac.com, ntlworld.com, tiscali.co.ul, mailinator.com and msn.com)
* 19,467 email addresses were classed as “likely spammers” (the domain was listed on http://www.stopforumspam.com/spamdomainsandips but wasn’t in the list of “common domains”)
* 5,029 “other” email addresses looked valid, had good DNS entries and were not listed on the common domains and “likely spammers” list
* 12 of those email accounts accounts were over quota and have not yet received the notification.
We are therefore counting the number of exposed “data users” as “common domains”+”others”:-”over quota”: 35,599.
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