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Suddenly can't send/receive - NOTHING HAS CHANGED

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As of today, I can no longer send or receive emails in Thunderbird. No settings were changed. I checked and everything is set up the way it should be. Bluehost also confirmed it all looks good.

SO WHY DID THUNDERBIRD DECIDE TO STOP WORKING TODAY? Fortunately I can still get the email within Webmail, but I prefer not to do that, since all my folders aren't set up there. Any ideas what caused this and more importantly, how can I fix it? I do have the latest version of TB.

The images show that it just sits there for a long time trying to send and then the other shows the resulting error message.

As of today, I can no longer send or receive emails in Thunderbird. No settings were changed. I checked and everything is set up the way it should be. Bluehost also confirmed it all looks good. SO WHY DID THUNDERBIRD DECIDE TO STOP WORKING TODAY? Fortunately I can still get the email within Webmail, but I prefer not to do that, since all my folders aren't set up there. Any ideas what caused this and more importantly, how can I fix it? I do have the latest version of TB. The images show that it just sits there for a long time trying to send and then the other shows the resulting error message.
Attached screenshots

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Hi, The message of the second screenshot says what the reason is. There is something preventing you to connect to the SMTP server from your local machine. There could be multiple reasons for that such as VPN, Antivirus program, problems with your ISP, etc.

To see where the problem is you could do: open your terminal/console and

> traceroute mail.concrete-creative.com (on Linux) > tracert mail.concrete-creative.com (win)

Then you see where the trace stops.

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