Err code: 553 on outgoing emails, incoming OK. This is new to me but I see others have suffered it before.
The problem had cleared by next morning.
It had affected all our btinternet addresses, let's hope it doesn't come back.
I really don't like the new web mail, it is not as easy to use as it used to be even when it is functioning normally.
Once again, I am unable to send emails from my btinternet web mail. There was no web address or link of any kind in the contents.
This is the error message ;
Sorry your email could not be delivered due to content policy reasons. Please check your message content for URLs, content and subject matter that could be construed as Malware, Spam or Phishing before retrying. (6-1-1-1) ID (5ED9AFBE0C1CB46B) [Err code: 553]
Welcome back to the Community.
Sorry to hear that you are unable to send emails from BT Mail.
Do you have a signature or anything like that at the bottom of your email that may include HTML?
In my case the problem was that I had a VPN working. BT's servers decided that I may be dangerous until I switched off the VPN.
The existence of a VPN, even if you think that you are not using it, seems to a major issue here. I have been testing mine and sure enough, every time I turn it on, my messages get blocked. Using an account linked to Outlook, the same thing happened and as this email was hosted by IONOS, then the issue may not be simply down to BT, though in truth, I cannot really be sure as my email traffic is handled by a BT box!!
My investigations continue...