Routinely at public hot spots I receive this error - nothing has changed in the account set up, but for some reason the client "cannot connect to your incoming (POP 3) email server." That server is "Pop.verizon.net" and has remained that for a very long time. I'm posting this to communicate with Verizon. The problem does not affect the other two (microsoft.com and phada.org) domain incoming servers I use, and so I'm presuming its on Verzon's end. I'm not looking for a "solution" since I'm usually not on connections that produce this error, but don't see any excuse for this ever happening.
