I had to reset my DNS for some changes lately twice. I had a third party create a new web-site for the company and after an entire weekend on their DNS server we almost received no email. I switched it back to the old DNS servers (Register.com) and email started coming in slowly. Now it has been 2 weeks and DNS report and Register.com see that our DNS is working fine, but I still have a few clients that can not email the company(of course our big clients) . Our email does reach them with no issues, but their email never reaches us. Any ideas?
Thanks for any help!