We have Thunderbird installed on 2 computers and, for the last 3 days, we have been to receive, but not send email. We can log in to our email provider online and send from there with no problem, so it's strictly a Thunderbird issue. We use Graceba/WoW for our email/internet, windows firewall, PC Matic AntiVirus, Windows 11, and Thunderbird version 147.0 (this information is the same for both computers). When we try to send an email with Thunderbird, the following error message pops up: "Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) smtp.graceba.net failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again." Our outgoing server settings are correct; nothing has changed and no updates have been done. Something happened over the course of a day 3 days ago (it was fine in the morning and not fine in the afternoon) that caused us to not be able to send email. Please help!