Email on blackist after switching to new panel

After switching to the new panel and transferring my email through an email forwarder. My email server has gotten blacklisted through mail.post.000webhost.com.

Can someone help fix this thanks

Where do you see the blacklist error?

showed up on mxtoolbox when I searched.

see img below

Only a few days and it will unlist, not every email provider uses the same blacklists though etc

appreciated thank you