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I've done a little research and from what I've read, it looks like it's not possible without using a plugin that connects to a third party website. But i'm also unsure if those plugins even work for 2.6. I know that an alternate method would be for me to just extract all of the users emails through phpmyadmin or something similar, and send out a mass email using a regular email client, but I was just wondering if it can be done through vanilla?