Yes, you will be prompted to opt-out during the setup process. Read the prompts slowly and carefully.Can you do that before setting up your accounts? Would be a bit pointless otherwise as it’s probably already scanned and shared your data before you turn of the setting.
A wise person would also use an e-mail account that has no messages/no archive/no notes/no address book for the initial setup. I have several such IMAP accounts. No data = no data mining = no ad revenue fodder. Give them valid login credentials for an empty account.
The first post-setup step would be to open up the application settings and go through them thoroughly a few times to make sure to turn off features, etc. that you don't want to be involved with. Review these periodically to make sure they don't try to sneak in new undesirable "features."
Personally I would never use my primary e-mail account with a brand new e-mail client.
Trust is EARNED.
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