Email could not be delivered

[Woody179!]

Hi,

I am having a problem sending email to a Tiscali email address. When I try to send an email to this account I receive a email stating Undelivered Mail Returned to Sender. The full message I receive is below (email address is blanked out but I will put the email address in my private notes).

This is the mail system at host mx-out.tt.xion.oxcs.net.

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

 host mx003.tt.xion.oxcs.net[135.125.7.163] said:

    550 5.5.1 Recipient rejected - OXSEU012_403 -

    https://postmaster-oxseu.vadesecure.com/inbound_error_codes/#_403 (in reply

    to RCPT TO command)

[Woody179!]

Hi,

Yes I'm at home now.

[siphosethu-TT]

Thank you for confirming that for me, please also confirm if you are currently at home so we're able to run diagnostics on this and hopefully have it sorted as soon as possible. Thanks

[Woody179!]

Hi @siphosethu-TT , yes that's correct, just this one Tiscali email address has the problem, I can send to all other email addresses fine, including others that are on tiscali.co.uk.

[siphosethu-TT]

Hi there Woody179, from what you stated above I take it you only have a problem with one specific email your unable to send too, correct? Thanks

[Woody179!]

Hi,

I am mostly using Outlook 365 but have also tried using webmail, I must also point out that everyone else I send an email to, they receive it fine, it is only this one email account that returns the problem.

[siphosethu-TT]

Hi there Woody179!, please confirm how you are accessing your emails, whether it's via app or webmail. Thanks

[Woody179!]

Good morning @angelique-TT , the problem only happens with this Tiscali email address, I can send to other email accounts at TalkTalk.net and other addresses fine.

[angelique-TT]

Good morning @Woody179! . Please confirm if this happens when trying to send an email to tiscali email addresses only or all email addresses?