sending emails to hotmail users
I am unable to send an email from Thunderbird to 2 hotmail accounts that I have been communicating with for several years. The issue has only recently started and I can send emails to them from another email account that I have on gmail and any other emails than these are fine from Thuderbird Below is the return message that I receive - can you help
"" This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed permanently:
* andyfmorris@hotmail.com
Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: ** andyfmorris@hotmail.com ??:?? This message was created automatically by mail delivery software on the server .
Reporting-MTA: dns; avasout-peh-004 [212.159.14.20]
Received-From-MTA: dns; [192.168.1.81] [51.7.113.34]
Arrival-Date: Tue, 17 Feb 2026 11:05:53 +0000
Final-recipient: rfc822; andyfmorris@hotmail.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [212.159.14.20] 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. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BCD72C9602F57A] [DU2PEPF00028D0F.eurprd03.prod.outlook.com 2026-02-17T11:05:53.185Z 08DE6B964EE3CE26]
Last-attempt-Date: Tue, 17 Feb 2026 11:05:53 +0000 ""
All Replies (1)
error 550 5.7.1 is not specific, but usually means a policy violation. that is, the receiving provider may suspect spam. Your posted message states that the email provider is blocked, so that seems the appropriate direction to resolve this. contact your email provider. What you can do is to check your SMTP settings to ensure that you are using the appropriate authentication for the account.
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