Blue Security may have been forced to close because of denial of service attacks from spammers, but the internet community is determined to carry on its work.
The work is being carried out as part of a group collaboration, using a wiki to co-ordinate the group's activities.
Industry analysts said the new version would need to spread its resources across multiple servers in multiple locations to minimise its vulnerability to spammers.
"If the new project is not to be as vulnerable to malicious attack as Blue Security was, it will need to be highly decentralised, so there is no single critical resource that can be attacked," said analyst Richi Jennings from Ferris Research.
"The project should also take care not to cross the line from legitimate spam complaints to attacking spammers using denial of service techniques, which was an early accusation levelled against Blue Frog."
Blue Security closed its service following attacks by spammers that kept it offline.
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