Great question and this is really really important...

There are multiple ways and it depends on your use case.

  1. You want to just send 1 customer an email: Simply click their email in their profile and send it from your favourite client!
  2. You want all customers to get certain information when they pay/order etc: Use our nifty email template editor to add the important information to the automated emails they are sent.
  3. You want to send a mass mailer to everyone to promote a new product or give time critical information: This is when you'd use an email marketing provider like Mailchimp (there's loads out there). You can setup the Zapier integration to send your customers email address to your chosen provider, when they purchase. You can also export customer data in the order export facility, and import it. Then you can send your campaign out!