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Can't send email in Thunderbird 60.2.1 - STARTTLS error when using SSL/TLS

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After upgrading to Thunderbird 60.2.1, I can no longer send messages. I'm running Linux 4.15.0-38-generic.

I get the attached error saying that I have problems with STARTTLS SMP. However, I have my connection security as SSL/TLS (second attachment). I haven't changed anything for years on my connection security. I successfully sent emails yesterday. Sending still works on my other machine (Windows) with v 59 and the same settings..

After upgrading to Thunderbird 60.2.1, I can no longer send messages. I'm running Linux 4.15.0-38-generic. I get the attached error saying that I have problems with STARTTLS SMP. However, I have my connection security as SSL/TLS (second attachment). I haven't changed anything for years on my connection security. I successfully sent emails yesterday. Sending still works on my other machine (Windows) with v 59 and the same settings..
Attached screenshots

Chosen solution

Perhaps scroll to the bottom of the account list where is says outgoing server (SMTP) and actually look at the outgoing server setting instead of the incoming ones. My guess they say STARTTLS.

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  • User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

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Matt
  • Top 10 Contributor
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3216 solutions 22015 answers

Chosen Solution

Perhaps scroll to the bottom of the account list where is says outgoing server (SMTP) and actually look at the outgoing server setting instead of the incoming ones. My guess they say STARTTLS.

Perhaps scroll to the bottom of the account list where is says outgoing server (SMTP) and actually look at the outgoing server setting instead of the incoming ones. My guess they say STARTTLS.

Question owner

Thanks. I changed it in this SECOND location back to SLS/TLS. However, now it hangs until it times out trying to send the message. I think I saw some notes about the new problem and will check them out. How do you suppose it got changed in the 2nd location to STARTTLS?

Thanks. I changed it in this SECOND location back to SLS/TLS. However, now it hangs until it times out trying to send the message. I think I saw some notes about the new problem and will check them out. How do you suppose it got changed in the 2nd location to STARTTLS?
Matt
  • Top 10 Contributor
  • Moderator
3216 solutions 22015 answers

Looks like these guys have yet another lot of server settings. https://www.spectrum.net/support/internet/email-settings/

Looks like these guys have yet another lot of server settings. https://www.spectrum.net/support/internet/email-settings/
Matt
  • Top 10 Contributor
  • Moderator
3216 solutions 22015 answers

I just tested those settings. They are underwritten with Certificates issues by Symantec. Perhaps they missed the mail from Symantec advising they messed up and the whole world was going to distrust their certificate in a years time. But they obviously have no taken any action.

mail.twc.com does have a valid certificate from digicert however.

So at this point perhaps try; Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.

I just tested those settings. They are underwritten with Certificates issues by Symantec. Perhaps they missed the mail from Symantec advising they messed up and the whole world was going to distrust their certificate in a years time. But they obviously have no taken any action. mail.twc.com does have a valid certificate from digicert however. So at this point perhaps try; Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
sfhowes
  • Top 10 Contributor
1438 solutions 6817 answers

Settings for TWC/Spectrum outgoing server:

mobile.charter.net on port 587, SSL/TLS, normal password authentication, User name = email address.

https://support.mozilla.org/en-US/questions/1234783#answer-1157069v

Settings for TWC/Spectrum outgoing server: mobile.charter.net on port 587, SSL/TLS, normal password authentication, User name = email address. https://support.mozilla.org/en-US/questions/1234783#answer-1157069v

Question owner

I shutdown my laptop and went away for the afternoon. When I restarted, the send mail was working just fine.

Evidently, I needed to have the outgoing server set up as STARTTLS, but the incoming server needs to remain SSL/TLS.

Don't know why, just that it now works. Magic? Thanks for all the help.

I shutdown my laptop and went away for the afternoon. When I restarted, the send mail was working just fine. Evidently, I needed to have the outgoing server set up as STARTTLS, but the incoming server needs to remain SSL/TLS. Don't know why, just that it now works. Magic? Thanks for all the help.