TThis is nott an issue with your server which is sending the email that you composed it has to do with the content of your email as formatted by your email software.
if you are not using outlook its still an issue with how your sending software is formatting the email you sent through our server which IS sending it but the recipients system has strict acceptance rules.
Content limiters in your email is too long means the recipients sytem told you they won't accept the email as formatted in their reply "message has lines too long for transport (received 1012, limit 998)_"
To get your email delivered, try the following quick fixes:
1. Start a fresh email: Copy your message and paste it into a brand-new compose window. This resets the header length.
2. Trim the thread: Delete older replies at the bottom of the email chain before clicking send
3. if your not using it, switch to webmail.listinmls.com Log into your web-based email to bypass the Outlook desktop app's formatting limits
4. Enable text wrapping: In Outlook, go to File > Options > Mail, scroll down to Message format, and check Automatically wrap text