Junk Mail rejected, Cannot not receive any emails

Sounds like your servers ip was blacklisted. This is usually a result of a compromised email account or web site sending mass amounts of spam. You can probably confirm this by looking at how big your mail queue is. Anything over a few hundred would be indicative of a problem The bigger it is the bigger the problem.

First you have to address the spam problem, but, really its tough to get resolved from a blacklist like this Many of them would remove you in a few days after the spam flow stops hut some won't do it automatically. Youd need to request delisting and that is iffy at best on getting a response.

You might consider a service like mailchannels where you route your email through them which usually.itigates existing blocks and prevents future problems

 

Oh sorry I misunderstood The rejection you posted normally indicates a sending problem.

Do you have the text of the rejection message your client got when sending to you?