Need a methode/plug in unlimited for read receipts

Need a methode/plug in unlimited for read receipts

I´m looking for a methode/plug in unlimited for read receipts, scheduling for Gmail Email in Firefox Browser. Don´t send me an offer Boomerang, Sidekick, Bananatack or what else.. Please let me your offer, Please let me your offer, Please let me your offer Please let me your offer

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Requirements

Have a look my Description

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Skills Required

Gmail Email Plugin Scheduling