Our domain subscription was cancelled this morning due to an expired credit card on the account. A slew of problems followed. We got our domain back up and running and Most of the problems have been resolved, but for some reason, we are still unable to receive external e-mails.
We have contacted our ISP and everything seems to be checking out fine.
We have:
-Reset our web filter
-Reset our Email server
-Verified DNS is functioning properly (Internally and Externally)
I went on mxtoolbox.com to see if I could pull any errors, and sure enough, this is what I found:
Shortly after taking this screenshot, I contacted our ISP again and notified them of these warnings. They proceeded to tell us that they were also having "computer problems". What that means remains to be seen at this point. I am still waiting on a call back.
Does anyone have any troubleshooting tips/advice for me to try? Could this just be our ISP?
*UPDATE 1 - 3:00 PM
Our ISP is guessing that we are in propagation, which is frustrating. Should we wait it out?
*UPDATE 2 - 3:35 PM
I did some more digging and found this post on Stack - How to troubleshoot unreceived emails that do not bounce back?
^ In short, the poster explains that ultimately, it was a problem with his provider. Their IP was blacklisted. I was curious, so I did a blacklist search on mxtools.com of our providers address, and boom. Their address was blacklisted.
I am waiting on a call back at the moment. When I get a response, I will edit my question and post an appropriate answer.
*UPDATE 3 - 6:00 PM (In response to an answer below) This information might be useful.
We do not host antivirus/antispam on our server. That is provided through our ISP.
Our ISP has notified us that the server hosting our spam filter is taking on a large processing load. However, there is no delay between sending/receiving messages. It either works, or it doesn't. It functions very sporadically, it works for 20 min, but then it wont work for an hour.
In the hour-long duration of not being able to receive external messages, we are getting a domain name error. Shown below: