WhiteListWhiteList 
The latest version of WhiteList is 1.14 on Mac Informer. It is a perfect match for E-mail in the Communication category. The app is developed by Patrick Stein.
WhiteList helps you efficiently manage your email contacts by generating a list of people you've interacted with. This list, often referred to as a whitelist for email spam, includes real individuals you’ve emailed, making it easier to ensure your important messages are delivered without issue. Export your whitelist as v-cards to quickly add contacts to your address book or email provider.
WhiteList automatically compiles a list of all the people you've emailed, sorting them by the frequency and volume of your communication with each person. You can export this list as a v-card file, which can be uploaded to your email provider’s mailbox to improve email deliverability. By doing so, your provider can better identify which emails should be accepted, helping avoid important messages from ending up in spam. Only email addresses are exported by default, ensuring your provider only receives the necessary contact information.
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