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ERROR CODE :550 - "JunkMail rejected - sender11-of-o51.zoho.eu [31.186.226.237]:21097 is in an RBL: "

Reporting-MTA: dns; mx.zohomail.eu
Arrival-Date: Tue, 10 Jan 2023 12:32:58 +0000

Original-Recipient: rfc822;
Final-Recipient: rfc822;
Status: 550
Action: failed
Last-Attempt-Date: 10 Jan 2023 12:33:57 GMT
Diagnostic-Code: "JunkMail rejected - sender11-of-o51.zoho.eu [31.186.226.237]:21097 is in an RBL: "