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Re:Greplin’s Chrome Extension Now Makes Gmail Search Infinit... by d_c on Friday April 15, 2011 @03:59PM (#2451963)
How do they access the data used to build their search index?
Re:Greplin’s Chrome Extension Now Makes Gmail Search Infinit... by smanek on Friday April 15, 2011 @04:26PM (#2452068)
You have to sign up at https://www.greplin.com, and grant us permission (via OAuth - so we never see your password) to index your mail for you.

See http://googlecode.blogspot.com/2010/03/oauth-access-to-imaps... for some details.