A recent problem I am having is trying to send emails to a certain yahoo account (ending .co.uk) This account is one of several in an organisation's domain. The message I'm getting from The Mail-Daemon service is as follows (recipients email address I've concealed):
This is the mail system at host relay.mailchannels.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
XXXXXXXXXXXXXX@yahoo.co.uk>: host mx-eu.mail.am0.yahoodns.net[188.125.72.73]
said: 554 5.7.9 Message not accepted for policy reasons. See
https://senders.yahooinc.com/error-codes (in reply to end of DATA command)
Reporting-MTA: dns; relay.mailchannels.net
X-Postfix-Queue-ID: 3C6FA2C92AC
X-Postfix-Sender: rfc822; rjdeverill@talktalk.net
Arrival-Date: Wed, 26 Feb 2025 22:42:52 +0000 (UTC)
Final-Recipient: rfc822; XXXXXXXXXXXXXX@yahoo.co.uk
Original-Recipient: rfc822; XXXXXXXXXXXXXX@yahoo.co.uk
Action: failed
Status: 5.7.9
Remote-MTA: dns; mx-eu.mail.am0.yahoodns.net
Diagnostic-Code: smtp; 554 5.7.9 Message not accepted for policy reasons. See
https://senders.yahooinc.com/error-codes
By chance I discovered that another person, also a TalkTalk user, has emailed the same recipient and had that email returned. This is an ongoing problem for me but I'm a bit out of my depth to know how to go about solving it. I use Thunderbird as client and have all the correct security settings. Can you help please.
