This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Mulongo oyo etiyamaki na archive. Tuna motuna mosusu soki osengeli na lisalisi

Email sent to Hotmail accounts gets returned as "Delivery Status Notification (failure"

more options

Hi, I hope someone can help with this. All of a sudden I can't send to Hotmail addresses - was working fine up until yesterday. Here's the full message that I get:

The following message to <jakenicoll@hotmail.com> was undeliverable. The reason for the problem: 5.1.0 - Unknown address error 550-"5.7.1 Unfortunately, messages from [134.153.136.23] 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. [DB3EUR04FT045.eop-eur04.prod.protection.outlook.com]"


Reporting-MTA: dns; esa03.ucs.mun.ca

Final-Recipient: rfc822;jakenicoll@hotmail.com Action: failed Status: 5.0.0 (permanent failure) Remote-MTA: dns; [104.47.12.33] Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-"5.7.1 Unfortunately, messages from [134.153.136.23] 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. [DB3EUR04FT045.eop-eur04.prod.protection.outlook.com]" (delivery attempts: 0)


Any thoughts or help is much appreciated. Got the same result with another friend who has a Hotmail account. Thanks!

Thanks Adrian

Hi, I hope someone can help with this. All of a sudden I can't send to Hotmail addresses - was working fine up until yesterday. Here's the full message that I get: The following message to <jakenicoll@hotmail.com> was undeliverable. The reason for the problem: 5.1.0 - Unknown address error 550-"5.7.1 Unfortunately, messages from [134.153.136.23] 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. [DB3EUR04FT045.eop-eur04.prod.protection.outlook.com]" Reporting-MTA: dns; esa03.ucs.mun.ca Final-Recipient: rfc822;jakenicoll@hotmail.com Action: failed Status: 5.0.0 (permanent failure) Remote-MTA: dns; [104.47.12.33] Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-"5.7.1 Unfortunately, messages from [134.153.136.23] 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. [DB3EUR04FT045.eop-eur04.prod.protection.outlook.com]" (delivery attempts: 0) Any thoughts or help is much appreciated. Got the same result with another friend who has a Hotmail account. Thanks! Thanks Adrian

Solution eye eponami

adrian.house said

Reporting-MTA: dns; esa03.ucs.mun.ca Please contact your Internet service provider since part of their network is on our block list (S3150).

This is a problem related to your email provider esa03.ucs.mun.ca. The Memorial University probably has a IT department that manage the email server. I think you should contact them and let them know their server has been blocked by Hotmail.

Tanga eyano oyo ndenge esengeli 👍 1

All Replies (2)

more options

Solution eye oponami

adrian.house said

Reporting-MTA: dns; esa03.ucs.mun.ca Please contact your Internet service provider since part of their network is on our block list (S3150).

This is a problem related to your email provider esa03.ucs.mun.ca. The Memorial University probably has a IT department that manage the email server. I think you should contact them and let them know their server has been blocked by Hotmail.

more options

Thanks a lot Danny. I spoke to them today and apparently someone sent out a lot of spam so Microsoft blocked one of their servers. They said they're working on the issue. Cheers, Adrian