550 5.7.1 IP listed on RBL (18.104.22.168 https://www.spamhaus.org/query/ip/22.214.171.124)
421 edge06.upcmail.net edge Dynamic/Generic hostnames are blocked. Please contact your Email Provider. Your IP was 126.96.36.199. Your hostname was x5d811afd.dyn.telefonica.de
554 The IP Address of the sender (188.8.131.52) was found in a DNS blacklist database and was therefore refused.
554 5.7.1 Service unavailable; Client host [184.108.40.206] blocked using pbl.spamhaus.org; https://www.spamhaus.org/query/ip/220.127.116.11
550 5.7.606 Access denied, banned sending IP [18.104.22.168]. 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)