Postmaster@outlook.com

If I send an email via my eM-Client account I receive always:

Remote Server returned ‘550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)’

Since several months now. If I use any other email software I have no dramas at all and all recepients will receive the message.

What has eM-Client changed to stop working?

Cheers

M