One way to limit these is to create a filter in your mail client to search your mail and identify all messages that contain the word "unsubscribe." I… - Scott Britton

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One way to limit these is to create a filter in your mail client to search your mail and identify all messages that contain the word "unsubscribe." If you're using Gmail, you can create a tag for these messages (ex. "optional") in order to easily identify mailing lists you don't need, so you can unsubscribe.