Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.juno.com timed out. Try again.

I have installed Mozilla ThunderBird Previously on many machines. Am Familiar with Incoming Email Servers and OutGoing Email Servers ... Also special ports ... POP ... and .... SMTP ... IMAP ... ETC ... GBGB On this Machine ... Dell Latitude ... 128 GB SSD ... 8GB RAM I have Mozilla ThunderBird Installed for as Single Email Account ... OverstreetENGR@Juno.com When I REPLY to Emails , THIS IS the error message that I get : Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.juno.com timed out. Try again.