Emails sent to ne are bounced as spam "The mail server detected your message as spam and has prevented delivery"

You can whitelist a domain if for some reason their mail is detected as spam by adding their domain to the whitelist in cPanel.

Log into your cPanel account and go to:

Apache SpamAssassin™ --> whitelist_from

Add the domain to whitelist as @domain.com or .domain.com

Click "Save" and then that domain will not be checked for spam when sending to you.