Hi @mtsl,
Welcome to the community!
Thanks for raising this to us, we'd love to help and get to the bottom off this, we did an article that you may find helpful. Please see the link below.
Cannot Send Email Rejected by the Server/Banned from using SMTP
Let me know how it will go.
Cheers!
Have been unable to send emails to any hotmail addresses for over a week. Example returned mail message below:
Final-Recipient: RFC822; xxxxx@hotmail.com
Action: failed
Status: 5.7.1
Diagnostic-Code: SMTP; 550 5.7.1 Unfortunately, messages from [203.12.160.131] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [HE1EUR04FT044.eop-eur04.prod.protection.outlook.com]
Last-Attempt-Date: Thu, 10 Jun 2021 09:55:26 +1000
The listed ip address on the block list belongs to TPG. I emailed helpdesk@tpg.com.au a couple of times, no response.
Why is hotmail blocking TPG mail?
