sM Client suddenly not working

Suddenly, after several issue-free years, I cannot send emails with eMClient.
All attempts are trapped in Outbox (yellow or redded).

There is also a pop up Operations / Errors box which I have no experience to understand…
Denshi: An Error occured
[SMTP] Cannot send Message (Sending email “Test” failed with error: Email body not accepted due to the following reason:
"Transaction failed
Reject due to policy restrictions
For explanation visit
https://www.ionos.com/help/Ondex.php.

Thsi started 2 days ago and I cannot send emails since then.
I spoke to IONOS but they could not help.

I am really in a mess ! Is eM client able to identify what is happening?

1 Like

I had the same problem.

It was solved when I installed 25H2. No idea why!
Incidentally, after installing 25H2 my computer was locked into “Light” mode. The solution was to goto PowerToys Admin and turn “Light Switch” OFF.

I solved it finally. Somehow my computer clock was changed one week forward. I never noticed that had occured as my wrist watch and other clocks were all correct and not showing “date” in any case.
When my wife noticed I was sometimes talking rubbish on dates, I finally realised and fixed my clocks.

Then to my surprise eMail was back working again.I guess IONOS my email provider blocked my account as a potential risk.