We're on a blacklist and can't get off!

[Jawloms]

We are with SBB and the IP we go out through is on blocklists somewhere. If I try and send to hotmail.com, I get this bounce;

 

HE1EUR04FT057.mail.protection.outlook.com rejected your message to the following e-mail addresses:

@hotmail.com (@hotmail.com)

HE1EUR04FT057.mail.protection.outlook.com gave this error:

Unfortunately, messages from [sBBs-IP-address] 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 Troubleshooting. [HE1EUR04FT057.eop-eur04.prod.protection.outlook.com 2023-10-19T08:17:24.397Z 08DBCFBB4ED5413A]

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 e-mail from certain senders, or another restriction may be preventing delivery.

 

 

 

 

 

Diagnostic information for administrators:

Generating server:

@hotmail.com

HE1EUR04FT057.mail.protection.outlook.com #550 5.7.1 Unfortunately, messages from [sBBs-IP-address] 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 Troubleshooting. [HE1EUR04FT057.eop-eur04.prod.protection.outlook.com 2023-10-19T08:17:24.397Z 08DBCFBB4ED5413A] ##

Original message headers:

Received: from

([fe80::41a6:418a:3e19:cd67]) by

([fe80::41a6:418a:3e19:cd67%10]) with mapi id 14.03.0513.000; Thu, 19 Oct

2023 09:17:23 +0100

From: my-work-email-address

To: "@hotmail.com" <@hotmail.com>

Subject: Still testing

Thread-Topic: Still testing

Thread-Index: AdoCZKtMa7doQsJqSrO6gB2uFX2MAQ==

Date: Thu, 19 Oct 2023 08:17:21 +0000

Message-ID: <7FE5E3044B2D0B4A8B8DE2A2B9D0F8E65E87C1FB@>

Accept-Language: en-GB, en-US

Content-Language: en-US

X-MS-Has-Attach:

X-MS-TNEF-Correlator:

x-originating-ip: [my-laptops-IP]

Content-Type: multipart/alternative;

boundary="_000_7FE5E3044B2D0B4A8B8DE2A2B9D0F8E65E87C1FBDHSExchangedebe_"

MIME-Version: 1.0

 

To me, that is saying that SBB's IP is the issue, but they don't know how to sort it out. We found the form at https://olcsupport.office.com/, and also lots of articles from people saying that form doesn't work.

 

Where do I go next? We are also unable to receive emails from a number of places. I'm hoping that getting this sorted will then resolve the incoming issues too somehow!

 

Thank you

[chaplic]

It might not help, but is your SPF, DMARC and DKIM watertight and allows sending from the SBB IP ranges? Have SBB maybe changed ranges and you've not updated?

[SchoolsBroadband]

The only thing we can initially do is to contact the ISP rejecting mail from our IPs and understand why we are on a block list they are using. Once they tell us who they get the block list from then we'll contact that block list provider and essentially argue with them that we shouldn't be blocked.

 

This does happen now and again. It sometimes happens when a customer has a compromised machine that has been dishing out lots of spam and then gets an IP block automatically banned because of it. It might be that the receiver has banned a range an IP resides in our of our netblocks or is actually just a single IP. Sometimes block lists are over sensitive and false positives do occur. This is though down to the blocklist and the mail providers which then use said blocklists.

 

This will I'm sure be with our NOC team to progress. If you'd like to pass me on the case ID i'll see where the team is at with it. It may be that we are waiting to hear from the recipient still. There is generally no quick fix we can do as we have to wait for the other party to unblock us.

@chaplic also makes a good point as well.

 

Thanks

 

Dave

[Jawloms]

This is with the team, and it is through that ticket that the representative has literally said he doesn't know what to do next, both yesterday and again this morning when I chased it. I'll PM you.

[mdrabble]

Have a look at MXToolbox - https://mxtoolbox.com/blacklists.aspx

 

May give you some further insights