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When you want to avoid certain emails, you will normally add a blocks to try and catch those emails and stop them from reaching you. The opposite approach is to maintain a list of addresses which you will accept email from. This list is called a whitelist.

Our whitelist system can automatically compile and maintain a list of email addresses that you correspond with. Emails from these addresses are accepted as normal. Emails from other addresses are accepted but added to a queue. Meanwhile, an email is sent to the reply address asking the sender to confirm that the address is valid. If they respond, their address is added to your whitelist and their queued emails are delivered. Any further emails they send are then accepted without further checks.

After receiving a configurable number of emails without a confirmation, the address is added to your blacklist. No further emails will be accepted from that address and any queued emails are deleted.

This system works well as a method of avoiding emails with falsified return addresses, while automatically allowing valid emails. You can, however, manually add entries to the whitelist (for example, if you exchange email addresses by phone) and delete entries from the blacklist at any time.