someone probably made a software that allowed them to go through all the forum profiles, filter the ones that dont have emails public then filter those that are inactive and then work from the final list
But according to the victims, the email was sent from
admin@bitcointalk.org. The forum maybe attacked (like its downtime few days before). Can the forum improve its security?
lol you should probably do some google. hint: search for "spoof emails".
that doesn't have anything to do with the security of the forum.
Theymos always improved the forum's security whenever he finds a vulnerability.