Hey Microsoft, if your PTR record for 52.100.19.14 returns "mail-cy1gcc01bn2014.outbound.protection.outlook.com.", but the A record for mail-cy1gcc01bn2014.outbound.protection.outlook.com has 127.0.0.1, you can't really expect stellar mail acceptance :-)
100.52.in-addr.arpa. 86400 IN NS ns3-08.azure-dns.org. 100.52.in-addr.arpa. 86400 IN NS ns1-08.azure-dns.com. 100.52.in-addr.arpa. 86400 IN NS ns2-08.azure-dns.net. 100.52.in-addr.arpa. 86400 IN NS ns4-08.azure-dns.info. 100.52.in-addr.arpa. 10800 IN NSEC 101.52.in-addr.arpa. NS RRSIG NSEC 100.52.in-addr.arpa. 10800 IN RRSIG NSEC 8 4 10800 20210820050657 20210806040657 60786 52.in-addr.arpa. m13tmKJOHXjj6HN4gc9W9EIUfBs10P3+duIPt8w/FjgG5+6Ww2NuPWg9 wUHajuu0LId+fFXTadhQME5ar/jdEYTeHy4A8DGSoC0ha+WbN2+KseS4 GSwSSaRqBfl8xQpzOP6dr7OBuO424hAb0yyEW634CBj/lebcG9F/JH9A VobknmBk+QzX7dspN9C20/zSKZLGVfBVNZOIo3GgzKVwX5Qc/l1T+yrY N003AlE2W05QHx8Ct28/wzNARM2e0A6COhfZ4c4EDBT51faoQeM3ZAqo NVg/wbBZB5Z9j9UOTriV2/ETvwbKGYRQn8JVSqXgU2sRCZaYv0Oe87QS cDIsFA== ;; Received 535 bytes from 192.82.134.30#53(y.arin.net) in 32 ms 14.19.100.52.in-addr.arpa. 3600 *IN PTR **mail-cy1gcc01bn2014.outbound.protection.outlook.com*. ;; Received 119 bytes from 64.4.48.8#53(ns2-08.azure-dns.net) in 36 ms outlook.com. 172800 IN NS nse12.o365filtering.com. outlook.com. 172800 IN NS nse13.o365filtering.com. outlook.com. 172800 IN NS nse21.o365filtering.com. outlook.com. 172800 IN NS nse24.o365filtering.com. outlook.com. 172800 IN NS ns4-38.azure-dns.info. outlook.com. 172800 IN NS ns3-38.azure-dns.org. outlook.com. 172800 IN NS ns2-38.azure-dns.net. outlook.com. 172800 IN NS ns1-38.azure-dns.com. CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN NSEC3 1 1 0 - CK0Q1GIN43N1ARRC9OSM6QPQR81H5M9A NS SOA RRSIG DNSKEY NSEC3PARAM CK0POJMG874LJREF7EFN8430QVIT8BSM.com. 86400 IN RRSIG NSEC3 8 2 86400 20210812042507 20210805031507 39343 com. u6LNzdMFxOkuUaR9FfCqOAvCB64M0PHgtyNs7mXRBV07sK2eVV55ebFM HiVyw0tLiO2XurS7uL8Y6IA0jbjwvOugWnkhUF6UYDA8RwmSYAviOesL OTRQBIBNTkHtx/AJaDOfxNO8Ps8b82GVqcTeZoVULq8DG7L8gDOk/FJK u2U1+uIJIUGUJjjFkj4Fnou01Ty/HaJvWFrA+njVfAmPjg== 4N822AIM85H3A7LSD1MKIE0P53LE55KD.com. 86400 IN NSEC3 1 1 0 - 4N829O36838VOEDEBI5NBD1TRPRNHRGU NS DS RRSIG 4N822AIM85H3A7LSD1MKIE0P53LE55KD.com. 86400 IN RRSIG NSEC3 8 2 86400 20210812051728 20210805040728 39343 com. lQlONGVL5laig+MPj1BJlQD170wVacOfEb+Sk7VBuzjItzMgjoZQNFnx JZMpiC3PZKvDWupZMLfTFqEQEqCcOTcKMqIMtkM+5bqM8rsrA7Hnhy2L 2Gb4nIh676uXh2Krct+6DpEaZAmJDDVDWQoelAJXaErxdMJmKLFbiSk8 NKiuTRhu8NyDIzHzdwN8WOA+PIDFt14kJrvWLucYwlUfTg== ;; Received 965 bytes from 2001:503:d2d::30#53(k.gtld-servers.net) in 88 ms protection.outlook.com. 7200 IN NS ns1-gtm.glbdns.o365filtering.com. protection.outlook.com. 7200 IN NS ns2-gtm.glbdns.o365filtering.com. ;; Received 145 bytes from 13.107.222.38#53(ns3-38.azure-dns.org) in 88 ms mail-cy1gcc01bn2014.outbound.protection.outlook.com. 600 *IN A 127.0.0.1* protection.outlook.com. 600 IN NS ns2-gtm.glbdns.o365filtering.com. protection.outlook.com. 600 IN NS ns1-gtm.glbdns.o365filtering.com. ;; Received 161 bytes from 104.47.38.8#53(ns2-gtm.glbdns.o365filtering.com) in 104 ms I believe there are tools out there to maintain consistent DNS records... Cheers, Hans-Martin
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