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seen Mar 20 at 15:37

Mar
8
comment Get e-mail addresses from Gmail messages received
Yes agreed but there is one caveat to using contacts over extract tools, you may have messed with your contacts, a lot of us do when we 'tidy up' as the OP suggests as his messages are archived. At this point you are now not sure if you have 'all' your email addresses? I was in this situation and having looked at all answers here the starbanana one was quite simply the most elegant and trustworthy (it uses two step auth and app specific passwords) and a direct connection from my PC to gmail so no man in the middle listening.
Nov
9
comment Get e-mail addresses from Gmail messages received
starbanana.com now extracts emails out of the body too, I just tried it and the multi-threading also (does 15 labels at the same time) incredibly fast well impressed.
Nov
7
awarded  Teacher
Dec
22
answered Export Gmail messages to text or HTML files