Unable to send emails to outlook

[edataservi]

Hi,

I would like to seek help with email delivery to outlook. it's been 2 months now since we encountered the issue - unable to send to outlook. We are receiving NDR from outlook.

Moreover, we have our own mail exchange server.

Below is the Delivery Message

Delivery has failed to these recipients or groups:

Email address removed
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery.

Diagnostic information for administrators:

Generating server: mailgateway.edataservices.com

Email address removed
Remote Server returned '554 5.7.1 < #5.7.1 SMTP; 550 5.7.1 Unfortunately, messages from [61.28.174.150] 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. [BN1NAM02FT014.eop-nam02.prod.protection.outlook.com]>'

Original message headers:

Return-Path: <Email address removed>Received: from mail.edataservices.com (exh05.itsrvr01.com [172.30.1.37])        by mailgateway.edataservices.com  with ESMTP id 20P0XTfr028317-20P0XTft028317        (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=CAFAIL)        for <Email address removed>; Tue, 25 Jan 2022 08:33:29 +0800Received: from EXH06.itsrvr01.com (172.30.1.197) by EXH05.itsrvr01.com (172.30.1.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.858.15; Tue, 25 Jan 2022 08:33:29 +0800Received: from EXH06.itsrvr01.com ([fe80::3128:a202:d762:dc45]) by EXH06.itsrvr01.com ([fe80::3128:a202:d762:dc45%8]) with mapi id 15.02.0858.015; Tue, 25 Jan 2022 08:33:29 +0800From: "Ester G. Policarpio" <Email address removed>To: "Email address removed" <Email address removed>Subject: test 01252022Thread-Topic: test 01252022Thread-Index: AdgRgynvN9wSHFVlQS6cZSt+1rHLsA==Date: Tue, 25 Jan 2022 00:33:28 +0000Message-ID: <Email address removed>Accept-Language: en-AS, en-USContent-Language: en-USX-MS-Has-Attach:X-MS-TNEF-Correlator:x-originating-ip: [192.168.80.31]Content-Type: multipart/alternative;        boundary="_000_08a031f9ccc14415898a02214fc57bd6edataservicescom_"MIME-Version: 1.0

We hope that you could help us with our concern.

[#2]

We have the same problem and unfortunately we are unable to solve this situation through the delisting form from Microsoft. From the tests done, the entire class of IPs is in the block
list (S3150) .
I remain disappointed by Microsoft's non-existent support.

This is the mail system at host mail.onlineportal.ro.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<email address removed for privacy reasons>: host
outlook-com.olc.protection.outlook.com[104.47.55.33] said: 550 5.7.1
Unfortunately, messages from [81.196.131.130] 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.
[MW2NAM10FT079.eop-nam10.prod.protection.outlook.com
2023-05-23T04:21:24.342Z 08DB5A87823D2D3E] (in reply to MAIL FROM command)
Reporting-MTA: dns; mail.onlineportal.ro
X-Postfix-Queue-ID: B3605DC64683
X-Postfix-Sender: rfc822; email address removed for privacy reasons
Arrival-Date: Tue, 23 May 2023 07:21:22 +0300 (EEST)

Final-Recipient: rfc822; email address removed for privacy reasons
Original-Recipient: rfc822;email address removed for privacy reasons
Action: failed
Status: 5.7.1
Remote-MTA: dns; outlook-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [81.196.131.130]
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.
[MW2NAM10FT079.eop-nam10.prod.protection.outlook.com
2023-05-23T04:21:24.342Z 08DB5A87823D2D3E]

From: Vali Barbu <email address removed for privacy reasons>
Subject: Re: test1
Date: 23 May 2023 at 07:21:07 EEST
To: Barbu Valentin <email address removed for privacy reasons>