Web app connects your Mailchimp account to Facebook Messenger allowing you to send your newsletter to all of your fans through this channel.
Free version for up to 1000 FB Messenger subscribers (Mailport branding).
Pro version $19/mo for unlimited subscribers.
Pricing: https://mailport.io/pricing
My comment: Interesting alternative to increase distribution and reach of email newsletter via Facebook. Worth trying.
Try it out now: https://mailport.io