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Updated to Thunderbird 140 for Mac and now cannot send emails -- on two different machines: one an iMac (OS 18.5), the other a MacBook (OS 17.x).

About 10 or 20 seconds after hitting "Send", we get an error message saying "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: EHLO [13 hex characters] internal error AUP#EML-005."

Our settings and password have not changed, and they are all correct according to our ISP.

Have tried a clean re-install. Did not help.

What to do?

subj line says it: current new mail is coming in - some 147 older mails in yahoo inbox are not seen by t/bird. I can't find anything obvious. New tbird release 140.0.1. It is correct, there are no NEW emails - how to get older ones?

Good day, I just set up my university account on thunderbird, but cannot receive any mails, I have checked everything listed in the designated page but nothing seems to work, would you have any solutions? Thank you very much (and I know I am not providing a lot of info, it is because I really don't understand what is happening, sorry!)

Since the July 2025 update I can receive emails and forward and reply to emails but I can't create a new email. When I click on + New Message nothing happens, the write window doesn't open. Therefore I think my in and out servers are working fine but can't get the send new email window.

Where the hell to you input your password so the silly email app can get messages and send some? I filled up everything related to all my email addresses. The only thing that seem to be a secret is WHY I don't get any emails, although Thunderbird has all my passwords in a list.

Why making thing so complicated and annoying? Thank you

using Tbird, 3 email accounts are working fine. login to att mail server fails always. Att server settings: imap, port 993, ssl, normal password, smtp port 465. i can login to att from web apps and numerous email programs. I want to use Tbird again, have previously used it for years!

Failure to download email from Optus. I have spent a number oif hours to no avail talking and typing with the Optus staff regarding this problem. 1. I can send email from TB but cannot receive. 2. I can see the incoming emails in their Webmail site. 3. Optus confirm my settings are correct for both the mail server and SMTP server. When I go to Settings> Security > Passwords > remove server so I can re-submit my password, the only one showing is the SMTP server. Should the incoming mail server also be shown?

I am frustrated and ready to dump TB but have bee with it many years and don't want to start again with another programme as I am 83 and am partially blind. Please can anyone assist?

Updated to Thunderbird 140 for Mac (OS 18.5 and 17.x) and now cannot send emails -- on two different machines: one an iMac, the other a MacBook.

About 10 or 20 seconds after hitting "Send", we get an error message saying "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: EHLO [13 hex characters] internal error AUP#EML-005."

Our settings and password have not changed, and they are all correct according to our ISP.

Hi, I wonder if anyone has had a similar problem - since a few days I get an immediate SMTP timeout in Thunderbird for some mail servers but not all. For Outlook the same server works just fine. Version 140.0.1esr has recently been autoinstalled. It is possible that the problems started when that version was installed but I am not sure about the timing. The email provider has no explanation and claims there is no problem on its side. Also, Thunderbird has recently asked me to confirm a server certificate for receiving emails. Usually when that happens I also get asked the same question when sending emails, but this time I did not get the question for sending, I just get the timeout message.

Thanks,

Magnus