Hotmail rejecting e-mails from tiscali.co.uk domain

[kenpragnell]

I am sending an e-mail from Thunderbird to a hotmail.com address.  It has been bounced twice now, with a message that the sending domain (tiscali.co.uk) has a DMARC policy of reject.

I have sent many e-mails to this addressee previously, so why is there suddenly a problem?

[Ady-TalkTalk]

Thank you I've passed those details to the team to investigate. 

Ady

[kenpragnell]

The hotmail address that is rejecting my e-mails is ******@hotmail.com

[Ady-TalkTalk]

Hi kenpragnell, please send me a personal message with the hotmail email addresses that are rejecting your mails.

Ady

[kenpragnell]

It's happening again.

The following is an extract from the error message:

(reason: 550 5.7.509 Access denied, sending domain [TISCALI.CO.UK] does not pass DMARC verification and has a...D19BE0D1CD6DD] [CO1PEPF000044EE.namprd05.prod.outlook.com 2024-12-13T22:44:00.895Z 08DD19469C47EAED])

   ----- Transcript of session follows -----
... while talking to hotmail-com.olc.protection.outlook.com.:

DATA

<<< 550 5.7.509 Access denied, sending domain [TISCALI.CO.UK] does not pass DMARC verification and has a DMARC policy of reject. [CWXP123MB3845.GBRP123.PROD.OUTLOOK.COM 2024-12-13T22:44:00.811Z 08DD1B45DB29F57E] [BYAPR05CA0024.namprd05.prod.outlook.com 2024-12-13T22:44:00.884Z 08DD19BE0D1CD6DD] [CO1PEPF000044EE.namprd05.prod.outlook.com 2024-12-13T22:44:00.895Z 08DD19469C47EAED]
554 5.0.0 Service unavailable

.  Seems like Hotmail has a problem with e-mails from Tiscali.

[Ady-TalkTalk]

Thanks for letting us know. 

Ady

[kenpragnell]

As I had sent many e-mails to hotmail addresses before I reported the issue and I've sent several since then, it doesn't fit with a problem in my e-mail settings.  More likely, I think, that there was a glitch somewhere in the link between Talktalk and Hotmail.  However, since it seems to be working OK again now, I don't have the time to pursue it further.

[Ady-TalkTalk]

Hi kenpragnell, have you checked your settings against those in the Email Settings help article?

Ady