Hello mail peoples, two of my servers are on MS blocklist for unknown reasons. SNDS says `All of the specified IPs have normal status`, JMRP only had the occasional false-positive.
550 5.7.1 Unfortunately, messages from [185.149.214.63] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). I've used the postmaster form to ask for mitigation, received the auto-reply and tried to reply to escalate, but received the following error: <[email protected]>: host sponaeop.mail.protection.outlook.com[52.101.10.1] said: 550 5.7.64 TenantAttribution; Relay Access Denied [BN2PEPF000044A1.namprd02.prod.outlook.com 2026-05-06T08:45:31.059Z 08DEA7410A480943] (in reply to RCPT TO command) I am confused why I'd get a "Relay Access Denied" error? Regards, Thomas Walter -- Thomas Walter Datenverarbeitungszentrale FH Münster - University of Applied Sciences - Corrensstr. 25, Raum B 112 48149 Münster Tel: +49 251 83 64 908 Fax: +49 251 83 64 910 www.fh-muenster.de/dvz/
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