SMTP error from remote mail server after initial connection

Hello, I am new to the forum. I appreciate any and all help. I am getting the above error message. 

Here is the Full message and after that what my web host replied:

Thank you,
Stephen

Error Message:

This message was created automatically by mail delivery software.
 
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
 
scrowe@gmx.com
host mx00.gmx.net [212.227.15.10]
SMTP error from remote mail server after initial connection:
554-gmx.net (mxgmx017) Nemesis ESMTP Service not available
554-No SMTP service
554-IP address is black listed.

554 For explanation visit http://postmaster.gmx.com/en/error-messages?ip=192.154.97.50&c=bl

From Webhost:

https://lifetime.hosting/secure

Hello,

I could see that your local machine IP was blocked in server firewall for below reason.

csf.deny: 24.154.64.99 # lfd: (smtpauth) Failed SMTP AUTH login from 24.154.64.99 (US/United States/static-acs-24-154-64-99.zoominternet.net): 5 in the last 3600 secs - Thu Dec 14 13:55:53 2017

Now you can able to access the webmail without any issue also please use the correct user name and password and reconfigure the mail client.

Lifetime.Hosting
Pay Once - Host Forever

Check out our video tutorials at http://lifetime.hosting/secure/index.php?m=tutorial_viewer

Have we closed this ticket before you are done? No worries, just reply to this email and the ticket will re-open automatically. This is just how we keep the help desk organized.


Ticket ID: #388387
Subject: EMAIL ISSUES [MERGED]
Status: Answered

Ticket URL: https://lifetime.hosting/secure/viewticket.php?tid=388387&c=TgVj45Xm

Hi Stephen.
Was this post just sharing the information that your IP address is blocked by GMX, or is there an actual question involved.