posts from Talktalk.net domain being blocked

[Tinkerer]

I posted this request yesterday but it seems to have disappeared, so here is my second attempt.

I send emails to members of my club through the email service run by the club's webhosting company www.one.com.

recently some of those emails have been bounced back as rejected and the accompanying message, which I have copied at the end of this request, seems to indicate that the posts from the  talktalk.net domain are being blocked.  Neither of the ip addresses mentioned are mine (I checked on line).  Can anyone advise please?

Message received from remote postmaster (I have obscured the intended recipient's address):

"This is the mail system at host mx4.pub.mailpod9-cph3.one.com.

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

<##########@btinternet.com> failed: host mx.bt.prod.cloud.openwave.ai

 (65.20.50.207) said: 571 DMARC Reject (5.7.1.2) on 2025/01/27 13:41:08 GMT  from un-validated IP address: 185.164.14.124. The DMARC policy for the domain  talktalk.net tells us to reject this email. We protected our customers by not  allowing any more emails from your IP address till we notice an improvement.

 You may have been affected unknowingly through your email provider. Please  contact your email provider to assist. Our Postmaster will be unable to help  you. (in reply to EOD command)"

[Ady-TalkTalk]

Hi Keith, if you want to be able to forward your emails then you'd have to use another email address. 

Ady

[Tinkerer]

Hi Ady,

As I understand it then, the TalkTalk server basically instructs the server at www.one.com not to forward the email, resulting in non delivery to the recipient and the "postmaster" message I am receiving.  I assume also that there is no way around it other than scrapping my TalkTalk email and starting an account with another provider, something I don't really relish but, as most of our committee work is done via the club email addresses, I may have no choice about.  Is my understanding correct please?

Keith

[Ady-TalkTalk]

Hi Keith, the forwarding stopped working when OX took control of the anti virus and anti spam functions due to the amount of spam being forwarded through our mail servers. Mail forwarding is no longer allowed.

Ady

[Tinkerer]

Hi Ady,

Two things to report. Firstly, about 10 hours after I received the last postmaster message saying my test email had been rejected, I received a message from the recipient that it had just arrived.  I sent a reply thanking him and immediately received another identical remote postmaster message that my reply had been rejected.

Since then I have seen your last message.  As requested, I sent another test email from TalkTalk webmail to my recipients actual address (the BTinternet one that www.one.com automatically forward to).  There was no remote postmaster message and shortly after I heard that the test email had arrived. 

I take it then that the problem is arising due to the routing via one.com, but I need to sort it because most of his emails are for our whole committee and require a "reply to all" response which automatically goes back to his club address (i.e. the club website at one.com).  I should add that this has worked fine for many years so something has upset the apple cart.  I am very suspicious of the .ai at the end of the BT address in the postmaster report, could it mean Artificial Intelligence, something I have heard to be a bit of a mixed benefit?  Do you have any suggestions please?

Keith (Tinkerer)

[Ady-TalkTalk]

Unfortunately, it's the mail forwarding that causes the DMARC failure as it's not sending direct from TalkTalk.net. What I need you to do is to login to TalkTalk webmail and send straight to the recipient if you use any forwarding it will fail due to DMARK. 

Ady

[Tinkerer]

Hi Ady,

I have sent an email to the same address from webmail and immediately received the message below.  If it helps, the club address I sent it to, that forwards the email to the recipient, is ######@probus-teddington-hampton.org.uk and it is hosted by www.one .com.  I have edited the recipient's name above and in the message below for privacy.

Message from remote postmaster:

This is the mail system at host mx2.pub.mailpod9-cph3.one.com.

I'm sorry to have to inform you that your message could not

be delivered to one or more recipients. It's attached below.

<######@btinternet.com> failed: host mx.bt.prod.cloud.openwave.ai

 (65.20.50.207) said: 571 DMARC Reject (5.7.1.2) on 2025/01/30 11:18:35 GMT

 from un-validated IP address: 185.164.14.119. The DMARC policy for the domain

 talktalk.net tells us to reject this email. We protected our customers by not

 allowing any more emails from your IP address till we notice an improvement.

 You may have been affected unknowingly through your email provider. Please

 contact your email provider to assist. Our Postmaster will be unable to help

 you. (in reply to EOD command)

[Ady-TalkTalk]

Hi Tinkerer, please confirm that the same happens when you login to TalkTalk webmail and send directly to the intended recipients. 

Ady

[Divsec]

Hi @Tinkerer  I strongly suspect that there are changes going on in the background which are causing these issues. Hopefully they will be resolved sooner than later I strongly suspect that there are changes going on in the background which are causing these issues. Hopefully they will be resolved sooner than later.