A better "industry best practice" for comparing address books
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Re: A better "industry best practice" for comparing address books
#2tl; dr: Send hashes of email addresses in the contact list instead of sending the addresses and compare.
Re: A better "industry best practice" for comparing address books
#3I wrote this post. We have opt-in, hash-based address book comparison working in a fairly popular consumer app, if anyone is interested in sharing experiences. I recommend it as the way to go.