I keep getting this warning. I have no idea what it means and the link it shows is dead

Crashing eM Client
1

Cannot send email due to this recurring error…PLEASE HELP

2

I would follow the link, but the image is of such low quality that it is not possible to see the url.

Best option is to contact GMX support, who are really quite helpful, and will be able to explain why their server is rejecting your message.

3

https://postmaster.gmx.net/en/error-messages

Hello, is this acccount the first time connected to GMX?
What say the login in GMX webmail (Webpage)?

4

Like I said the link I got was dead

5

As this isn’t an eM Client issue, but your provider rejecting messages coming from your IP address, you could either contact them or your Internet provider for further assistance.