Hi! My name is ***** ***** I will be assisting you. Let's get started!
Are you using an email program?
Is it happening to multiple email addresses or just one?
To all Hotmail accounts?
What is your domain?
Thank you. I wanted to check to see if your domain was blacklisted at all and it is not.
Was that the full error messages that you pasted above or was there more to it?
Yes, I am.
Are you the person the "IT" person for the company that would fix email related issues?
I will opt out of this question so that someone can review your PHP script that is being sent out. Something within that script is being rejected by Microsoft/Hotmail servers.
Hi there and welcome
If you look at the from address it is Webservice Kursanmeldung
Hotmail requires it to be an actual email address.
Update your script so it is an actual email address in the from field and tell me if it then sends correctly please.