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I get this message when I try to send emails Sending of message failed. An error occurred while sending mail. The mail server responded: mf-505: Sender Policy - Relay Denied. Please verify that your email address is correct in your account settings and try again. How to I find out this information

How to avoid: Sending of the message failed. An error occurred while sending mail. The mail server responded: message rejected .

AUP#SNDR. Please check the message and try again.

Last week I deleted about 600 emails from the inbox, leaving about 500. I shut down the computer for 5 days then rebooted. TB seemed to start up ok. I deleted the remaining 500 emails. Emptied the trash folder. Tried to pull new emails to the inbox. I usually receive 100 - 200 emails per day but could not receive any this time.

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

I have thunderbird installed on my PC, and my main email account is a gmail account. I download from gmail using POP protocol (SSL/TLS connection security, OAuth2 authentication). I have been using these settings for a long time (15 years?).

This afternoon, thunderbird stopped downloading my messages. No error messages : just "no new messages to download".

I can see (by logging directly into my gmail account using my browser) that there are new messages on the server. They're not spam or junk, and they're not getting downloaded into my (local) spam folder. They're not getting downloaded at all.

I still have room on the google server (it's about 87% full), and room on the hard drive on my computer (about 3 GB).

Yesterday I found that I can't send mail using Yahoo.ca. I was able to get my wife's computer working by sending an email. A message came on the browser and I logged in to Yahoo. She can now send email. When I tried the same thing on my computer, I get a message "No apps available". I have spent hours trying and can't get around the message. The simplest test is as follows:

• create a new profile, and open the new profile
• enter my name and email address, and continue
• I get a message "Configuration found in Mozilla ISPDB." It uses SSL/TLS and Oauth2
• I hit next. Yahoo opens a page in my browser to log in. I enter the password and the security code sent by text
• The browser sends a message to allow an app. When I allow it the message "No apps available" appears as shown.

The release notes on Thunderbird are Version 153.0 | Released July 21, 2026 For now, I can use a second account on gmx.com to send mail, but prefer to use Yahoo when it works. Any suggestions?

I have had Thunderbird on my Mac Monterey synced to my Comcast email address with no problems. Usually I have to enter my Comcast password when I send the first message for the day. It has caused no real problems since I obtained this computer, probably sometime in 2021. Within 2023 I obtained a Windows 10, onto which I also put Thunderbird. Last November I upgraded to Windows 11 had kept Thunderbird. I did not do the upgrade myself. The technician used Google Drive and OneDrive for backup. I added a GMAIL address on that system to my Thunderbird installation on Windows 11. For the past week Thunderbird has been popping up a Comcast site requesting that I enter my Comcast password. This is bizarre! How can I get my Thunderbird to behave more normally on my Windows 11? Thanks in advance. The technician only did the upgrade. I did the subsequent program reinstallations.

Hello, Bonjour, Since few time when i want to send an Email it is impossible and that i get with any Email address everytime the following message !!!

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/37.65.161.172 for further information. Veuillez vérifier l’adresse du destinataire et essayer à nouveau.

Would you telle me what i can do ? Thank you so much. Merci beaucoup Regards. Alain

Hello,

I would like to report what appears to be a bug in Thunderbird for Android.

I use a POP3 account with the following settings:

POP3 Port 995 SSL/TLS

The same account works correctly in Thunderbird for Windows.

The problem only occurs in Thunderbird for Android.

What happens:

New emails arrive and are initially displayed in Thunderbird for Android. After the next synchronization, some messages disappear from the Inbox. The messages are not deleted from the server because they are still visible in Thunderbird for Windows. I also tested the same POP3 account in Samsung Email on the same Android phone. Samsung Email continues to show the messages correctly while Thunderbird for Android no longer shows them.

Troubleshooting already performed:

Reinstalled Thunderbird for Android. Removed and added the account again. Tested on both my Android phone and Android tablet. The same problem occurs on both devices.

Is this a known issue with POP3 accounts, or is there another setting I should check?

Thank you very much for your help.

Best regards, Diana

I use Windows 10 and Thunderbird for email but I can NOT SEND anymore to anyone. I got an error message that said, "Authentication Required" and gave me a web address go to but google says it no longer available. Tell me how to fix Thunderbird so I can SEND messages again..

Linux Mint 22.3, Cinnamon Thunderbird 153.0 esr

clicking on 'get messages' produces no response. zero. Nothing happens. two email accounts are affected.

Consistently Reproducible.

Brian

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

I have smtp.gmail.com set up as my outgoing server (port 465, username = my gmail address, Authentication = OAuth2, connection security = SSL/TLS, also tried STARTTLS with port 587). There doesn't appear to be any way to set the password in the "Outgoing Server (SMTP) Settings", even when I click "Edit". Nor can I add a password to the "Edit/Privacy&Security/Saved Passwords" dialog box (which allows you to see existing passwords or remove them, but not add any).

When I try to send an email, the "Sending Message" dialog box pops up, and after a few seconds a second box pops labeled "Login to account 'smtp.gmai.com' failed". This box has three buttons: "Enter New Password", Cancel and Retry. Clicking on the "Enter New Password" button does not offer me the chance to enter a new password--instead, it immediately takes me back to the "Sending Message" box, which then immediately takes me back to the "Login...failed" box. There is never an opportunity to enter the password!

TBird 140.7.0esr, Thunderbird for Linux Mint. Mint version 22.3.

Sending works ok if I choose a different SMTP server.

I have been using Thunderbird for years and am on version 152.0.1

I also regularly use the Mail Merge add-on and this has worked great. However, just come to use it and it has put 80 messages into my Outbox but I cannot get them to send!

I hit the "Send Unsent Messages" and nothing happens.

Very frustrating and would be very happy if someone can help identify the problem!

I have recently not been able to send outgoing email through thunderbird. I can send and receive and send on my regular email service but not through thunderbird. I can receive but not send on thunderbird

Hello. When handling a large volume of emails, some sent messages are not saved in the Sent folder. As a result, they are only saved on the 3rd or 4th attempt, and the recipient receives 3-4 copies of the same email. What could be causing this issue and how can it be resolved? We reinstalled the client and configured it to save sent emails to a different folder, but all without success.