Connection issues began a few weeks ago and have since gotten worse. Normally takes multiple attempts now to send a single message. I am using Thunderbird, but also have exactly same issues with PostBox and other clients. I have also tried webmail and have same issues there as well. Error message typically says: The message could not be sent because the connection to Outgoing server (SMTP) ****.prod.phx3.secureserver.net was lost in the middle of the transaction. Less frequently there is reference to server timeout. Now here's what's interesting. If using Thunderbird I can open account settings and select "Edit SMTP server..." then click on "OK" (without changing anything) and the message will transmit on the very next attempt. This is repeatable and 99% consistent. Note also that from the same email client I can send messages via ATT or Gmail without ever a problem. So this pretty much isolates the problem to cpanel/DNS setup. I've checked that and I believe all the necessary DNS records are present and correct. Perhaps there is an extraneous record but I would not know how to identify it.