If there are certain kinds of mail you want to receive (or block) even if you don’t know the identity of the sender, ChoiceMail lets you create custom permission rules.

For example, let’s say you’re interested in elephants. You might choose to create a rule to accept any message with “elephant” in the subject line or body of the message.

The most common use for this feature is to accept newsletters or informational messages on topics of interest to you when you don’t know or can’t anticipate the exact source of the message.