Hi,
one of our pub-ip seems to be blocked by MS. Side effect is, that olc.protection... is not offering starttls in this case. Anyone else seen that? # telnet eur.olc.protection.outlook.com. 25 Trying 104.47.18.161... Connected to eur.olc.protection.outlook.com. Escape character is '^]'. 220 AM7EUR06FT011.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 31 Dec 2020 09:21:40 +0000 ehlo mydomain.com 250-AM7EUR06FT011.mail.protection.outlook.com Hello [116.203.31.6] 250-SIZE 49283072 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-BINARYMIME 250-CHUNKING 250 SMTPUTF8 SNDS reports: 116.203.31.6,116.203.31.6,Yes,Blocked due to user complaints or other evidence of spamming However the real data is only available the next day on https://sendersupport.olc.protection.outlook.com/snds/data.aspx . How does one deal with that situation? We monitor our outgoing mails but did not catch/see any malicious/spammy mail recently from this node/host. Stefan
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