Thunderbird Community Forum

I am having problems sending email form my account, [redacted]@smartpointproducts.ca. I login successfully and the program responds saying the account has been successfully registered however, it still refuses to send emails from this account.

Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'.

Hello, in Thunderbird I would like to set up my own acknowledgment of receipt for incoming mails. How can I do that?

(In the forum I only found the setting that I get a receipt.)

Thank you in advance for your help

How do I Charge Priority for an email in Thunderbird for Mac? That function is greyed out. What is the fix or workaround? I have version 158.0, do I need a newer version?

Hi, I would like to install Thunderbird on my computer to connect it to my Wanadoo account. What are the settings: IMAP, ...? I also want to install the folder structure on another drive to avoid loading my system drive. What other things should I be careful about to avoid making mistakes or wrong settings or security ? Eventually, I would also like to add another Gmail account or another provider. Thanks in advance

When i send an email , it goes to the destination email address all right, but the problem is that it creates two identical entries in my local "sent" folder. As if i had sent the email msg two times. This happens only with my hotmail.com account. All of my other accounts (gmail, yahoo etc) dont have this problem. I am using a windows 11 laptop, and both my windows and Tunderbird are fully updated.

I have been getting the following error message each time I log into my email today: " The STAT command did not succeed. Error getting message number and sizes. Mail server pop.bluedomino.com responded: [SYS/TEMP] Internal error occurred. Refer to server log for more information. [2026-10-14 12:31:46]" I get a message for each of my email accounts. My spouse also gets the message on hers. The server we use has just been transfered from Blue Domino to Network Solutions.

A week ago my sent emails were being rejected and the error message included something about bluehost (I called them and it was fixed within the day). Now it's happening again and my error message says:

host eig-east.smtp.a.cloudfilter.net [3.228.35.199]

   SMTP error from remote mail server after end of data:
   550 Connection Rejected - see http://www.spamhaus.org/query/ip/162.241.218.139 AUP#BL

I receive emails yo simon@padworks.plus.com, but cannot send them, with a message saying ...

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

please also reply to simondowthwaite246@gmail.com

I have used Thunderbird for years and have updated new versions. This past week, I can no longer compose new emails; no prompt given for that function. What can I do? I am not a computer geek, so I don't really know how to fix this problem, which seems to be a software issue. Thank you.

I have not been able to get my emails today from Charter on my desktop. Everything was working fine yesterday but nothing in coming through today. It looks like it might load, message that it is downloading 1 of 26 and then says nothing to download. I look on Charter website and there are current emails to download but Thunderbird must have a glitch. I have been on the phone with Charter twice, all the settings are correct for incoming and outgoing ports.

I have looked at the settings in Thunderbird and they are correct. I can get the emails on my iPad and iPhone with the Thunderbird app but not the desktop.

Can anyone give me some direction of where to check next?

I use emojis in email, but recipients report that the text of the email arrives covered with emojis. I thought it was a problem with the receiver until a second person just reported the same issue with an email I sent them. Both are gmail accounts . . .

Bonjour, La copie des messages envoyés n'apparait pas toujours dans le dossier des messages envoyés. C'est très gênant, comment faire pour rétablir la situation? Je voudrai avoir en copie TOUS les messages envoyés. MERCI

I have been getting 'message blocked due to spam content' errors trying to send messages for the last two months on messages as short as three words. Not all but over half of them.

Cannot receive and email because I am told by AVAST that the certificate for inbound.att.net has been revoked. I am not at all technical and at a loss as what to do. Please help! Thank you.

This morning I started getting this popup in lower right part of my screen every minute :

Mozilla ESR Thunderbird Connection to server inbound.att.net has been reset

It continues over and over as TB tries to get new messages.

Also, AVG Free antivirus is telling me it has identified a site certification problem. LOCATION: inbound.att.net (POP) Process: thunderbird.exe Detected by: Email Shield

In TB Help it says I'm currently on the esr uipdate channel .....whatever that means Whats the issue here? Can anyone help?