Emailed being rejected from an Amazon SES IP address

Dear Amazon. Please either sort out this IP address (76.223.180.3) or remove it from your pool for ap-south-1. Refer to see bounce notification below:

{"notificationType":"Bounce","bounce":{"feedbackId":"01090183ba5cfe35-d0fed3b5-ca5e-4c55-9b88-e88081ca576d-000000","bounceType":"Transient","bounceSubType":"General","bouncedRecipients":[{"emailAddress":"REDACTED@hotmail.fr ","action":"failed","status":"5.7.1","diagnosticCode":"smtp; 550 5.7.1 Unfortunately, messages from [76.223.180.3] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors . [AM6EUR05FT060.eop-eur05.prod.protection.outlook.com ]"}],"timestamp":"2022-10-09T01:30:00.000Z","remoteMtaIp":"104.47.18.97","reportingMTA":"dns; c180-3.smtp-out.ap-south-1.amazonses.com "},"mail":{"timestamp":"2022-10-09T01:29:58.460Z","source":"info@REDACTED ","sourceArn":"arn:aws:ses:ap-south-1:REDACTED:identity/REDACTED","sourceIp":"REDACTED","callerIdentity":"ses-smtp-user.20201217-221145","sendingAccountId":"REDACTED","messageId":"01090183ba5cf7bc-444ec2e6-b96f-4f6f-b8a7-46bcec8a2dac-000000","destination":["REDACTED@hotmail.fr "],"headersTruncated":false,"headers":[{"name":"Received","value":"from REDACTED ([REDACTED]) by email-smtp.amazonaws.com  with SMTP (SimpleEmailService-d-0NU5RY97J) id YEblTafH6wWTtpnr5wO0 for REDACTED@hotmail.fr ; Sun, 09 Oct 2022 01:29:58 +0000 (UTC)"},{"name":"MIME-Version","value":"1.0"},{"name":"From","value":"\"REDACTED\" <info@REDACTED >"},{"name":"To","value":"REDACTED@hotmail.fr "},{"name":"Date","value":"9 Oct 2022 04:29:58 +0300"},{"name":"Subject","value":"=?utf-8?B?TmV3IEZlYXR1cmUg8J+OiSBJbWFnZSBSZW9yZGVyaW5nIPCf?=\r\n =?utf-8?B?lIA=?="},{"name":"Content-Type","value":"text/html; charset=us-ascii"},{"name":"Content-Transfer-Encoding","value":"quoted-printable"}],"commonHeaders":{"from":["REDACTED <info@REDACTED >"],"date":"9 Oct 2022 04:29:58 +0300","to":["REDACTED@hotmail.fr "],"subject":"REDACTED"}}}

We've got loads of these from Outlook and Hotmail recipients.

By the way, if anyone reading this can recommend another SES region which is more reliable than ap-south-1 for sending email then please let me know.