Getting Started with Email
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      3. Getting Started with Email

      What are the IP addresses you use to send email so that I can whitelist them?

      Test messages and network mailings come from our primary mail service. The domain and IP address pointing to this server are:

      o1.smtp.butterflypublisher.com [208.117.49.62]
      o2.smtp.contentmx.net [167.89.103.236]