Mail Delivery System Error

Question

Getting the following mail delivery system errors on all items sent from desktop, any advice on how to fix it, able to send emails from my phone with no issues- host eur.olc.protection.outlook.com [104.47.18.161] SMTP error from remote mail server after pipelined sending data block: 550 5.7.1 Unfortunately, messages weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150).

Answer 1

Anesu, thank you so much for your prompt response but it turned out it was an issue with the parental control settings of my internet provider which I was able to sort through their app.

Answer 2

Hi Maria McLaughlin,

Thank you for your reply and update.

Awesome, I'm glade that you managed to sort out the scenario from your end and thank you for sharing this resolution which will assist community member who might run into this scenario.

Thanks for your time, efforts and cooperation.

Have a nice day.

Sincerely,

Anesu | Microsoft Community Moderator

Answer 3

Dear Maria McLaughlin,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

I understand that you have a concern on Mail Delivery Errors.

Thank you for your time and efforts on troubleshooting this from your end. I kindly want to collect more details on the scenario you are encountering to help us isolate the concern.

Kindly share with us the information below:

1. Could you kindly share with us the detailed Non delivery report details to check entire error message (note: hide email/domain/IP details).

Your understanding is much appreciated. Thanks for your cooperation.

Sincerely,

Anesu | Microsoft Community Moderator