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I have two domain accounts; crumpcorp.com and dannycrump.com with GoDaddy. I have two E-mail accounts; [redacted] @crumpcorp.com and [redacted] @dannycrump.com. I use Thunderbird desktop Email. Thunderbird has the ability of use filters to perform automatic actions on messages received. One of the filters is “Forward Message To”. Unfortunately, attempting to forward messages fails. Thunderbird displays the following message:

Sending of the message failed. An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again.

Please help with this issue.

Please respond to [redacted from community support forum] @dannycrump.com

After updating to 153.0.1esr(aarch64). the SEND button has disappeared. There's no way to send an email. (I can receive emails.) I am a Mac mini M2 Pro. OS 26.4.1

I cannot find a link to download a previous release of Thuderbird, which was working fine until this update.

My account setting correctly are set to store send mail in send of the account. Now: - Shoud be: a send mail goes always there - Is A send mail goes sometimes to the local send folder

Pleas, tel me how to corect that.

Kind Regards, Ruud

On Saturday morning 27 June 2026 I tried to login my Orcon email account via Thunderbird (which I have been using for a long time). But my login didn't work, I got a message saying "login to POP3.orcon.net.nz with username habitation failed." On 30th June 2026 I reported the problem to Orcon.

Orcon gave me the following settings for Thunderbird. I have done that and even made a new account: Incoming Server Type: IMAP Mail Server: imap.orcon.net.nz Port: 143 SSL: Off Authentication: On (username and password required)

Outgoing SMTP Server: Mail Server: smtp.orcon.net.nz Port: 25 SSL: Off Authentication: Off

Since then I have spent many hours and going around in circles with Orcon's Technical Support to resolve this, but no luck. They blame Thunderbird. I used Thunderbird Troubleshoot Mode. The message that comes up reads: login to server mail orcon.net.nz with username habitation failed. Please can you check that your server settings above are correct? And if there is a bug? Irma

Hi!

I have configured a EWS email account that requires manual configuration (I need to pass the override Office365 settings with application ID, tenand ID,...). When I select manual config I can configure the EWS server settings OK and the receiving part works OK. The problem is the outgoing server is not created OK (it is imap with password setup). I need to use the same EWS to send the email, imap is not allowed in the account. And I cannot configure the account to use EWS as the outgoing server. The outgoing server cannot be EWS and I need to setup one. So I'm in a loop.

For what I have read, thunderbird can send the email using EWS (https://support.mozilla.org/en-US/kb/thunderbird-and-exchange), but my feeling is that using manual setup (which I need to do to configure this account) breaks something internally and the outgoing is separated from the EWS receiving part. And I cannot configure back to use the internal EWS configuration in the receiving server part.

Can I do something to send emails using the same EWS configuration? What does the automatic setup to use the EWS configuration? Is there any bug for this situation?

Thanks in advance!

I have 5 emails setup on Thunderbird. I can receive emails for all 5 accounts. However, I can't send email on any of the accounts. I went through some of the old threads and tried to adjust the outgoing server, but I haven't been successful. Typically, I get a message like attached.

Ich habe mehrere email Accounts auf denen ich Benachrichtigungen über email Eingänge erhalte. Auf einem email Konto klappt das nicht. Ich finde keine Lösung dafür.

Ich bitte um Hilfe

Neither my wife nor I can access email on our respective PCs. This has been the case for four weeks. We can access email by our Android phones, but we really want to use our PCs. I've tried to resolve the problem and failed. Previous to this failure, I had an account with BT but this was transferred to EE. When I attempt to log in to my mail account, I receive the message "Could not connect ... :the connection was refused". I can also add is that in my Account settings, Outgoing Mail server I see a message "Connection to server mail.btinternet.com:465 failed."

The STAT command did not succeed. Error getting message number and sizes. Mail server pop.gmail.com responded: [SYS/PERM] Your account is not enabled for POP access. Please visit your Gmail settings page and enable your account for POP access.

TB suddenly moves messages from inbox to trash automatically without any interaction. Search through the forrum shows that it has been asked for already, see https://support.mozilla.org/en-US/questions/1588804, similar postings can also be found with you search engine.

As described in other postings, the messages are moved from Inbox to trash. When moving them back manually from trash to inbox, they are moved to trash again immediately.

• it happens for the default account only,
• there're no filters at all in TB,
• junk detection is disabled,
• Settings->General Storage is all disabled,
• (account)->Settings->Server Settings has checked "move deleted messages to trash",
• (account)->Settings->Storage is all disabled,
• Inbox->Properties "Repair folder" does not help,
• Inbox->Properties "rules is set to "use account settings" (and greyd out "do not delete messages"),
• exactly same behaviour when starting TB in save mode,
• manually deleting all *.msf files (for inbox) does not help,
• manually deleting xulstore.json does not help,

Additional notes, which are not related to the problem, IMHO:

• IMAP on port 993,
• no other clients anywhere are connected to that account,
• TB configured for more than 10 accounts, more than 500 folders and sub-folders,
• host with > 16GB RAM, TB uses 3GB virt,
• problem observerd in older TB also, at least 13x.x

I'd be happy to debug/trace the problem if someone can give me detailled insructions how to start TB with debugging. Please feel free to ask for about:config settings as they are non-ambiguous and language independent ;-)

Thanks.

Sending of a message failed because the Outgoing server (SMTP) send@xtra.co.nz failed. The server may be unavailable or is refusing SMTP connections.' This has happened irregularly over the last 2 months or so, even with a complete shutdown of all devices, power off and restarts. This is occurring in New Zealand. I have tried the suggestions from the web a few times, they have not helped

Suddenly thunderbird will not accept emails from Yahoo. It use to. The email shows up with a line through it like it has been deleted and the message is blank. How do I fix it? Someone suggested looking at options to see if it's blocked but I cant find the option button

Our email comes through SaskTel. They are making changes and suggest that we contact any other platforms we use to confirm they support DMARC-compliant email sending and to see if any updates are needed. Please provide this information to me. Thank You.

A message failed to send due to some issue with the mail server, and Thunderbird said I could choose to Send Later, which I chose to do. But that message disappeared (to me) - wasn't in Drafts, where did it go? Thanks,

Hi,

I'm having issues adding this email to Thunderbird. I did the steps below, but I am unable to add this email:

1. I enter my name and email (see image 1), then click Continue. 2. Outlook tab opens in my browser (see image 2). I enter my password and click Next. 3. Tab changes to Thunderbird - You're all Set (see image 3). 4. I go back to Thunderbird, and I see this (see image 4), then I click the Continue button. 5. After I click the Continue button, I see an error message (see image 5). 6. The email I tried to add isn't added, but the password is added to Thunderbird (see image 6).

When I go to https://outlook.live.com/mail/ in the browser I am logged in and can see my emails etc. So, the email address and password I entered is definitely correct. Also, Outlook has given Thunderbird access to the email account (see image 7).

Please advise what the issue is and how to fix it, so I can add the email to Thunderbird.

Thank you

Thunderbird 1 of 7 working Spectrum email accounts stopped retrieving email. Tried to setup the account on new computer and it will to connect to Spectrum's mail server. Able to setup the other 6 on new install Tried under windows and Linux same problem.

I have an email account that was establish 30 years ago that suddenly stop working in Thunderbird but it is accessible through Spectrum's web server.

Spectrum wants me to verify Thunderbird is not the problem. Sounds like passing the buck to me.

I need some help with this one.

I use Thunderbird on my desktop and since early June, I have not been able to receive any new messages but I can still send. Everything works fine on webmail (Yahoo) and phone (Samsung Galaxy), it's just my desktop which is affected . I asked Duck AI about this and this is what I got...

https://duckduckgo.com/?t=ffab&q=thunderbird+connection+to+server+pop.mail%2Cyaho.com++timed+out&atb=v417-1&ia=web

I tried the solutions offered without success.