550 5.7.1 IP listed on RBL (188.8.131.52 https://www.spamhaus.org/query/ip/184.108.40.206)
421 edge06.upcmail.net edge Dynamic/Generic hostnames are blocked. Please contact your Email Provider. Your IP was 220.127.116.11. Your hostname was x5d811afd.dyn.telefonica.de
554 The IP Address of the sender (18.104.22.168) was found in a DNS blacklist database and was therefore refused.
554 5.7.1 Service unavailable; Client host [22.214.171.124] blocked using pbl.spamhaus.org; https://www.spamhaus.org/query/ip/126.96.36.199
550 5.7.606 Access denied, banned sending IP [188.8.131.52]. To request removal from this list please visit https://sender.office.com/ and follow the directions. For more information please go to http://go.microsoft.com/fwlink/?LinkID=526655 (AS16012609)