18.164.115.140
server-18-164-115-140.jfk50.r.cloudfront.net
18.164.115.165
server-18-164-115-165.jfk50.r.cloudfront.net
18.164.115.17
server-18-164-115-17.jfk50.r.cloudfront.net
18.164.115.34
server-18-164-115-34.jfk50.r.cloudfront.net

us-smtp-inbound-1.mimecast.com.
us-smtp-inbound-2.mimecast.com.