Unable to receive emails even after configuring mx records

Unable to receive emails even after configuring mx records

Hi ,

I am unable to receive emails even after configuring MX records. 

It was working well before and stopped working after June 2018.

The response was:

550 The mail server could not deliver mail to parsu.vijay@pmexpertise.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.