Thunderbird Community Forum

My recollection is that prior to a recent automatic update to Thunderbird 140.12.1esr (64-bit) when I had a message composition window open, there were "SEND" button and possibly a "SEND LATER" button (to the left of the addressee and cc addresses in addition to the keyboard shortcuts (CTRL ENTER and CTRL SHIFT ENTER).

Following the update, there is no longer anything to the left of the addressee information. I have checked the toolbar menus, and there do not appear to be any button options. I can still send messages, but the lack of the buttons is a hindrance.

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.

Since about November 2025, all the mails I try to sent to @sfr.fr addresses (different recipients) fail and I get the following message: Sending of the message failed. An error occurred while sending mail. The mail server responded: <xxx.xxxx@sfr.fr> recipient domain rejected (blacklisted by local policy).

Please check the message recipient "xxx.xxxx@sfr.fr" and try again

I did not have this problem before. If I use Greenby's web mail (My email provider ), the messages are sent without any problem. I would very much appreciate some help to solve this problem! P.Y: pemy@pemyoung.plus.com

Hello. I have been unable to send email from one of several POP accounts on Thunderbird (v 115.18.0). I believe this occurred after Network Solutions changed the SMTP server for that email account. I am able to send email from my Gmail IMAP account setup on the same Thunderbird program on my PC. I have tried all the port and authentication settings for SLS/TLS and STARTTLS, changed/updated passwords, etc. I do not get any error messages, just never receive the test email I send to my other accounts. I updated the SMTP server on my iPhone mail app to the new NetSol SMTP and it works on that platform. I just cannot get it to work on Thunderbird on my PC. NetSol support said to delete account and start over which is not possible as it is my business email account. Also, the inbox is too large to back-up to an external drive. Any suggestions? Thanks in advance. John

How do I fix this Sending of message failed. An error occurred while sending mail. Th mail server responded Policy -MFRM53 Relay Denied-unauthoruzed. Please verify that your email address is correct in your account settings and try again What should I do

I upgraded my 2012 macbook pro to the latest version of thunderbird and I can not get my emails. I am running os10.15.8 Every time I try to get messages a yahoo page opens up and wants me to sign into my yahoo account. I can't get rid of the yahoo page it just keeps reopening again and again. Everything was working fine until I upgraded thunderbird to 153.0.3esr. My other mac that has not been upgraded can still get my emails.

Is it possible to go back to the prior versions of thunderbird or make this new version work with my mac?

I have had sky email for too many years to count. I have always used Mozilla Thunderbird for my emails on my laptop so that I can do essential housekeeping to manage my emails in to logical folders.

I won't bore you with the details but this week I have had an issue that resulted in deleting the 16 digit code. When I go through to the link

https://www.sky.com/sky-yahoo-mail/manage-apps

I get the following error message:

Sorry, something seems to have gone wrong. Please check your connection and try again later.

I have received this error message for the last week. I am going round in circles.

Can anyone help me to access my emails on Thunderbird?

Thunderbird version: 153.0.3 (64-bit), Meadow, release channel, fully up to date.

I can successfully insert my local PNG into a composed HTML email, tick “Attach this image to the message,” and add a hyperlink to the image. The hyperlink works when the email is sent.

The problem occurs when trying to use this permanently as the account signature. HTML signatures I've tried either lose the image, show a broken-image icon, or fail to preserve the clickable image when used automatically.

I have also tested an HTML signature using a local file:///C:/... image reference, which produces a broken-image icon in Thunderbird.

I do not want to host the image remotely. I want the PNG embedded in the HTML/signature and sent with each email.

Can you confirm the correct method specifically for Thunderbird 153.0.3 on Windows, and whether there is a current issue with embedded/Base64 images or clickable image signatures in this version?

One of the e-mails account receive mails verry slow for a few days. The other 2 works perfect. I have tryde all the sollutions I could find on internet, but I have still the problem

I am using Thunderbird Meadow.

Is it possible to send emails without a subject, other than getting the warning dialogue box.

It would be very useful.

Thank you

Thunderbird downloads new emails for all my emails except one. Has not downloaded on that one since July 3. Have reset various background settings to match other email accounts. Running on Windows 10. Suggestions?

Using the same settings as my main account: imap.gmail.com SSL/TLS 0Auth2 Tried copying in same local directory as one that is working. No idea what all these do...

I have used Thunderbird for years with complete success. Recently (within the past month) I have lost the ability to send (SMTP) mail and receive the following error message: "Send Message Error, 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)." [I just change my from address to another one going through Network Solutions and the mail sends just fine.]

Everything seems to be in order when checking my settings. I finally called Yahoo and spent an hour on the phone with them, including a supervisor (in the background) and they were unable to correct the situation. Yes, since I had called them from their tech support line (I looked it up; did not call anything sent to me) and they worked on my computer trying to fix it. They finally said it was a Thunderbird issue and said I needed to contact Thunderbird.

I am able to send from my phone (Android) using the same cox.net e-mail address. My wife is able to send from her computer using her cox.net via Thunderbird. My wife's incoming mail is IMAP while mine are all POP.

I happen to have several cox.net accounts and get the same SMTP error on all. However, all receive POP mail just fine, but see the next paragraph.

[As an aside (?), I should note that after Yahoo attempted to "fix" the problem, ALL my incoming cox.net mail comes into ALL of my cox.net accounts regardless of which one is addressed.]

I don't even know where to start at this point. Thanks for any help.

Bill

For a few weeks now, sent emails have not been appearing in the "Sent" folder. The recipient receives the email, but I have no confirmation in "Sent" that it was actually sent. It was never a problem.

Attached is a picture of what my account settings looks like. Thunderbird stopped syncing my emails from a gmail account. How do I get it to continue syncing my emails?

Sans aucune raison ni manipulation je n'ai plus de mails dans Thunderbird

J'ai quitté l'application, redémarré mon MacBook et rien n'y change. Quand je vais sur le webmail j'ai bien la totalité de mes mails. Par contre j'avais un dossier local et du coup je n'y ai plus accès non plus

After returning from a 6 day vacation, my wife attempted to download email from her Yahoo email account. There are nearly 200 messages that have piled up but they aren't moving. I've uninstalled and re-installed TB. I've uninstalled and reinstalled the app password in Yahoo. There is no problem with accessing the email via any web browser. I spent 49 minutes on a tech support call with Yahoo and they have said the problem is with TB because they repeated the same steps I have. I checked firewall settings and the only antivirus program on the computer is Malware Bytes and it's not running in the background. The version of TB is the most recent as of yesterday. I don't see any sketchy looking emails in the web version of Yahoo Mail when it's opened. It's set up as a POP3 account and has been since Cox Internet gave their email over to Yahoo. I'd appreciate any assistance in resolving this because it's currently above my pay grade and tech support at Yahoo.