54.192.48.123
server-54-192-48-123.yul62.r.cloudfront.net
54.192.48.23
server-54-192-48-23.yul62.r.cloudfront.net
54.192.48.47
server-54-192-48-47.yul62.r.cloudfront.net
54.192.48.96
server-54-192-48-96.yul62.r.cloudfront.net

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