We have just transitioned from one ISP to a 2nd ISP. All went well for the web side of things but we are finding that incoming eMail from external addresses is being handled by the OLD eMail server!? Is there something the NEW ISP must do to update the MX Record? It was my understanding this would follow the nameservers. (remember this is external hosted eMail - nothing fancy). IP Addresses all resolve to the NEW ISP and I can connect to their eMail server without issue.
How does it get corrected?