I have successfully used Thunderbird for years on one of my desktops. Suddenly on 8/5/20 I stopped receiving emails on this machine. I can still send them. I added another email address from the same internet provider & I can receive emails to that address. The inbound POP Server that stopped working is: pop.att.yahoo.com. The inbound POP Server that worked for the new email address is: inbound.att.net. I receive the missing emails on my phone, so the email address is working. My initial question is, if I just change the inbound server in The Server Name field to inbound.att.net, will I risk losing my received emails &/or the actual account in Thunderbird? Is this riskless? Also, today for the 1st time I received this popup message: "the DELE command did not succeed. Error marking a message as deleted. Mail server pop.att.yahoo.com responded: too many requests." Is this related? Thanks for any help