Incomming Mail Rejected 550

[clintlan]

I have never had any issues with my x10Hosting email service until now. It seems like the mail server does not want to accept any mail coming from my work email. When I send an outgoing email from my work email (not on x10Hosting) to my personal domain (on x10Hosting) it bounces back with the following message:

[198.xx.xx.x] said: 550-"JunkMail
rejected - xxx.xxx.com [50.xxx.xxx.xx]:57398 is 550-in an
RBL, see 450 delivery from 50.xxx.xxx.xx is deferred,repeatedly. 550-Send
again or check at
http://www.commtouch.com/Site/Resources/Check_IP_Reputation.asp.
550-Reference code: tid=0001.0A090301.5908FF1F.0048 550
ctid=1493764228.C65B50FB.26041" (in reply to RCPT TO command)

I have tried adjusting the Spam Assassian settings in the cPanel to whitelist my work's domain but that does not seem to be doing anything (unless I'm not waiting long enough for changes to take effect).

 

[clintlan]

It's partially working now after whitelisting under Spam Assassin. It's taking a long time for emails to come through.

 

[lylex10h]

Contact the IT department at your work, they are blacklisted.
RBL, see 450 delivery from 50.xxx.xxx.xx is deferred,repeatedly. RBL is realtime black list.