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Should I send GW's to a single address and wait for a reply, or just do a goodwill blitzkrieg and send multiple GW's to multiple addresses within a company?
I always found it best to start slow. Send one to the address on your CR(s) and wait it out 30-45 days. In the following month, send another to a different address and send a second to the prev. address. After that month, add a new address and send GWs to the prev. two. Keep expanding and I suggest rewriting your GWs monthly.