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Hi there, since recently, I encounter the following error message when trying to send emails via Thunderbird on my mobile: Failed to send some messages. Requested action not taken: mailbox unavailable DNS MX or A/AAAA resource record 1MgvvT...

The SMTP server settings are as shown on the attached screenshot. I haven't changed them since installing Thunderbird and the problem appears for the first time. Thunderbird version is 15.0.

Is there anything I can do about it, e.g. by changing my Thunderbird settings? Since gmx.net is a webmailing service, I cannot change their server configuration. Any help is highly appreciated. Thanks a lot to all of you!

On January 1 my desktop version stopped downloading my GMAIL but my other non gmail are still downloading

I use Windows 10 and the version of Thunderbird is 147.0 64 bit

What can I do to fix this?

my account [edited]@newmex.com won't load messages. my wife's account, [edited]@newmex.com is working properly. not sure how to fix this problem. our mail comes through taosnet.com and I can access messages there till we fix the problem.

2026-01-13

I used to get my emails from IMDp on my email account. I am not sure what I did to change something but I can no longer get emails.

What did I do to screw this up? Where do I go in the help list to get my emails back?

Thank you

I am trying to send emails from a software program through Mozilla to individual customers. I am receiving an error message. "Mailbox unavailable. The server response was: 5.7.1 Message detected as spam. [1768849024-673587]." Can you help??

Hello, since the end of December I can receive but can no longer send messages! I have this message for every faith: The sending of the message failed. An error occurred while sending the email. The mail server replied: Client host rejected by spamhaus for spamming issues; please refer to Listed by XBL, see https://check.spamhaus.org/query/ip/37.65.163.80 for further information. Please check the recipient address patricia.vollot@club-internet.fr and try again. I did malware, virus and other searches found nothing! on my other email addresses there is no problem. how to solve the problem. Thank you Mr. Vollot

Bonjour, depuis fin décembre je peux recevoir mais ne peux plus envoyer de message! j'ai ce message à chaque foi: L’envoi du message a échoué. Une erreur est survenue lors de l’envoi de l’e-mail. Le serveur de courrier a répondu : Client host rejected by spamhaus for spamming issues; please refer to Listed by XBL, see https://check.spamhaus.org/query/ip/37.65.163.80 for further information. Veuillez vérifier l’adresse du destinataire patricia.vollot@club-internet.fr et essayer à nouveau. j'ai fais des recherches de malware, virus et autres rien trouvé! sur mes autres adresses mails il n'y a pas de problème. comment résoudre le problème Merci M. Vollot

I've recently installed Thunderbird and configured it to connect to a few of the email accounts I've setup. For gmail servers, everything seems to work fine. For a locally run hMailServer server, I can connect, download messages, and even send messages - sort of.

When I try to send an email through the hMailServer account, the message sends correctly: it arrives at the other address quite quickly, and I can see in the server's logs where it connected via SMTP, transmitted the message, received a "250 Queued" response, sent QUIT to log off, and got the "221 goodbye". However the Thunderbird UI itself never progresses past the Sending Message dialog: the status stays at Sending message... and the progress bar is full. I can hit cancel and it prompts to delete the draft, etc., but either way, the message has been successfully sent. This doesn't happen with other accounts, so I'm curious what I need to do to get this to go away or send correctly....

I'm using Thunderbird 147.

Hello, I am using TB 140.7.0esr. I have five email accounts in TB and all send emails but one. This one email receives IMAP emails, but will not send. All emails accounts are hosted on Godaddy Office 365. The one I am having issues keeps popping up the dialog box to enter password when sending. When I click on the button to add a new passoword, TB just tries sending again. It never shows the popup to enter the new password. I have deleted this account and installed new, still same issue, only on this one email acount.

Thank you, JR

I have just changed to a new pc. Thunderbird was working fine until Saturday when it stopped sending emails. I have discovered that the username on the outgoing server is missing but there is no method of adding it and I have spent all day trying to find a way, including twice reinstalling Thunderbird which has brought back the same issue each time. Any advice on the web seems to be for older versions.

Hi Thunderbird, At the weekend we accidentally completely deleted some Gmail emails from Apple Mail . These were also deleted from Thunderbird (2 Gmail accounts) on our PC. We recovered the emails, in the process having to change my Google Password. Whilst the deleted emails returned, one Thunderbird Gmail account was not receiving new incoming emails. (one account is) The emails are arriving as normal into Gmail. After various unsuccessful attempts to to connect to the server I deleted the defective Gmail account from Thunderbird, using the Red Button in account settings, hoping to then be able to reinstall it as a new account. When I attempt to reinstall the now "deleted" account I get the yellow "Unable to log in at Server" message. . The password I am using to add the account is the same as the one I use to sign into that account on Gmail (set on Monday), but it does not seem to be working on TB. I tried the trick of not putting in the password when setting up the new account but this did not work either. I am using TB 140.6.0esr Any suggestion please John

I've read this is a common issue but hoping maybe things have changed? Trying to make a filter that says move to the junk folder email where subject starts [SPAM] (the hosting service adds that) UNLESS the address is in an address book, BUT I also need to accept everything from numerous domains. I see work arounds "if the address ends in @somedomain.com" but then I'd have to do that for every domain I want to receive from. Any email from any address where I have put *@domain.com in my address book should be let through. But I know TB doesn't accept wild cards in the address book. There MUST be some way around this? Thanks.

For the past 3 years I have not been able to send emails using either "@me.com" or "@icloud.com". All other providers such as "@gmail.com" and "@outlook.com" work perfectly. The only exception to this is when an email sent to me using my account name can it be used to respond. I assume therefore that there is an error in my settings for the SMTP server are wrong.

The SMTP server settings allowed in the TBird settings are as follows:

Description: user choice (I have tried my forename and the word "Apple" - no difference) Server name: smtp.mail.me.com or smtp.mail.icloud.com (either should be accepted) Port: 587 or 465

Connection security: None, STARTTLS, or SSL/TLS Authentication method: No Authentication, Normal password, Encrypted password, Kerberos/GSSAPI or NTLM

user name: my name (my name)

The message I get when I try to send a email with any combination of the above is "Login to server imap.mail.me.com with username xxxxxxxxxxxx failed."

I have other accounts listed in TBird. None of them have this issue.

Both Firefox and Thunderbird are up to date (115.31.0 for FF and 115.18.0 for TB)

Can you please advise me on this. It has been an issue for the 3 years or so. As I use the Apple account for family members only it is particularly frustrating!

When I have Thunderbird desktop running but I am focused in another application, I receive a popup notification when a new email is received. In the popup, there is an X to make the notification disappear, but it would be very handy if there was also a trash can icon where, if you clicked on it, the message would be deleted from your inbox without having to go back to the TB app. I didn't see any such options in TB settings, and I have searched the forum to no avail. Is this possible? Thank you.

BlueHost has confirmed that our email (joe@wrigleyranch.com) and/or IP have not been blocked or blacklisted. We tested this together using the BlueHost WebMail app directly and can send and receive emails without an issue. We then tried again to send through Thunderbird. This is the exact and complete error message we received as we attempted to send a test message:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

 barbarawidener@gmail.com
   host eig-east.smtp.a.cloudfilter.net [18.215.58.191]
   SMTP error from remote mail server after end of data:
   550 Connection Rejected - see http://www.spamhaus.org/query/ip/162.241.225.213 AUP#BL

Reporting-MTA: dns; box5293.bluehost.com

Action: failed Final-Recipient: rfc822;barbarawidener@gmail.com Status: 5.0.0 Remote-MTA: dns; eig-east.smtp.a.cloudfilter.net Diagnostic-Code: smtp; 550 Connection Rejected - see http://www.spamhaus.org/query/ip/162.241.225.213 AUP#BL

This did not occur until the latest update by Thunderbird/Mozilla on Jan 14, 2026 at 7:35pm, MST. It is ONLY Thunderbird that is refusing to send messages, returning this SMTP error message. BlueHost contends that since we are not blacklisted anywhere that this must be an error generated somehow by Thunderbird as we can send email through BlueHost web mail without an issue or rejection. Spamhaus.org also confirms that we are not blacklisted nor restricted. We are only affected when trying to use Thunderbird that we have been using for well over 5 years without any type of problem whatsoever... ever.

We are, however, getting a very odd message from you as we reset our password when we had trouble using our stored password:

We received a request for a password change on your Mozilla account from: Chrome on Mac OS X 10.15.7 Phoenix, AZ, United States (estimated) Sunday, Jan 18, 2026 3:04:13 PM (MST)

WE ARE ON MAC OS X VENTURA 13.7.8. AND THE BROWSER WE ARE USING IS "BRAVE," NOT CHROME. Does this indicate or imply anything that may be wrong??? We are North of Phoenix in Flagstaff, AZ. So, this seems correct as an estimated location (150 miles North).

We need your help!!

Joe Amadeo 928 635 1108 landline, no texts joe@wrigleyranch.com

On my PC Thunderbirds sending/receiving mail says the mail server refused my connection. My laptop works fine. I have duplicated my laptops in/out specifications onto the PC but still nothing works. Spectrum says everything on their end is fine but can't vouch for roadrunner who is the rr in my mail address of ca.rr.com. All this started about 4 days ago. Any ideas on what to try next? Thanks.