Thunderbird Community Forum

I have just used a saved email address to write an email. When I went to send it the send failed because the from account was an old account I do not use anymore.

How do I change saved email addresses so they do not use the old account.

Why would this happen.

I checked which account I was using at the time and then repeated the process with the same result. I was using my current account.

Dell Desktop - Windows 10 to Lenovo Laptop Windows 11 I followed the Alternative Manual Transfer between Windows 10/11 Roaming Profile and Local Profile Now on Lenova - Mozilla will not open - Profile Missing - Your Thunderbird profile cannot be loaded. It may be missing or inaccessible. I do not know how to uninstall it or how to start over.

Hello,

My internet provider is RCN. For the past couple of months, I’ve occasionally been getting the message, “Connection to server imap.rcn.com timed out.” As a result, I’m unable to receive emails via Thunderbird.

All my settings are correct. Usually, the problem resolves itself within 24 hours, but sometimes, like this time, it lasts longer.

Any suggestions? Best, Magda

I am trying to add an email address to Thunderbird on my laptop and I keep getting an authentication error when I enter the password. All the same information has been used for the same email address on my phone and works fine.

I wanted to share a specific startup freeze loop I encountered today.

I had a moderate number of tabs open in Thunderbird when I quit the app. I had set up a single IMAP message filter yesterday to automatically move incoming automated text alerts into their own folder (causing about 50–60 small emails arriving in quick succession this morning at startup).

The Problem: Upon starting up, the app almost immediately choked and became unresponsive. Unlike the freeze report by another user here on August 21st.

My Workaround: After a few attempts to open Thunderbird I managed to break the freeze loop by instantly closing the single open UI window right at startup. This kept T-bird running invisibly in the macOS background. It seemed that without the need of rendering the UI, the background engine successfully completed all the IMAP syncing and filtering tasks.

When I brought Thunderbird back to the foreground, all my open tabs instantly "snapped", and the app has been perfectly stable since. I haven't tried to replicate this due to the fear of breaking the current stability.

Has anyone else recently noticed Thunderbird freezing under similar conditions lately? Let us know if this workaround helps you get past your startup freezes too!

This is simple. Getting here is not. The issue is the zoom feature which many years ago I could not find. Now it is available and that is great, except: The CTRL + and CTRL - do not work until you first use the function in the menu. Once I use it in the menu I can use the key stroke several times to get it where I can read it. Every time though I have to go to the View function in the menu first. Simple fix.

Randy

Can't sign in or change password. can't get mail or send. I have email through Yahoo. (Comcast.com) The below message pops up all the time.

Login to server imap.mail.yahoo.com with username xxxxers@comcast.net failed.

my email [redacted]@comcast.net

I believe with Update 154,0 my thunderbird has been freezing up. I can't see, to compress files or select some folders. After a few minutes everything freezes up. 21 AUGUST 2026

[redacted] @gmail.com

/edit: unlocked as other was made as duplicate.

I have had a problem the last few months with my power/sleep settings in Windows being reset to "Never" and it appears to happen when I get Thunderbird updates. Have I done something incorrectly?

“My Spectrum email address is [redacted]@charter.net. Spectrum webmail can send and Thunderbird can't receive or send. The outgoing server is mobile.charter.net and the connection times out. I tested the connection from my computer and ports 587 and 465 both respond successfully. Thunderbird is set to No Proxy. when i tried to send today, it gave me this message, "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) mobile.charter.net timed out. Try again." i contacted spectrum about this and now when i try to send, it says nothing and the message never arrives.

Dear Sirs,

I want to configure my email ID sundar@srikrishnalogistics.com (provided by rediffmailpro.com) in Thunderbird.

I have already tried configuring the account.

• • • • • • • • • • • email from support@rediffenterprisepro.com

To configure a Rediffmail Pro email account in Thunderbird using IMAP, use the following settings:

1. Open Thunderbird Go to Account Settings >> Account Actions >> Add Mail Account. Enter: Your Name: User's name Email Address: sundar@srikrishnalogistics.com Password: Email account password Click Configure manually.

2. Enter IMAP settings Incoming Server (IMAP) Server: imap.rediffmailpro.com Port: 993 Connection Security: SSL/TLS Authentication Method: Normal Password Username: Full email address

Outgoing Server (SMTP) Server: smtp.rediffmailpro.com Port: 587 Connection Security: STARTTLS Authentication Method: Normal Password Username: Full email address Then click Re-test → Done.

3. Verify synchronization After configuration, Thunderbird should synchronize the mailbox folders with the Rediffmail Pro server.

Important: If the user wants all emails to remain on the server, ensure the account is configured as IMAP, not POP.

Since all the folders are visible but only a few emails are appearing in Inbox, Sent Items, and other folders, kindly check the following:

   Open Thunderbird >> Account Settings >> Server Settings and confirm that the account is configured as IMAP.
   Right-click the email account in Thunderbird and select Subscribe.
   Ensure that all required folders are selected/subscribed.
   Right-click the account and select Get Messages to initiate synchronization.
   Please allow some time for Thunderbird to complete the synchronization, especially if the mailbox contains a large number of emails.

• • • • • • • • • • • • even after doing the above problem exists

i have done the above but still problem is there. All the folders are appearing in Thunderbird, but most folders contain very few emails or no emails at all, whereas there are many more emails available in the webmail.

Kindly guide me in configuring Thunderbird properly so that all my emails and folders are synchronized correctly.

Regards, Sundar Ram

can you add an option into the program that when it cant read the local emails from the disk for some reason, then it would ask for my permission to re-download everything and/or add an option to close or restart the program?

there is some really annoying bug when the Pc is in the process of using all of the available Ram (for some reason) and when i open TB at the same time, everything gets really slow, and instead of actually pausing to figure out what is wrong, the ******** ********** ****** just starts to throw in even more work to download all of the emails again for some reason, not even giving any explanation why it wants to do it in the 1st place....................... (while the screen even just blanks out, just because there isnt enough Ram avail to display all of this *********** *****........)

My inbox shows only 3 unread emails, but the total for the folder shows 32. If I use filter for 'attachment emails' it displays 12 emails but not the unread ones. I have played with the filters and it will only display 3 unread and if selected 12 attachment emails. I have two accounts on thunderbird email client on Win 11 and the other one is fine, this one only started to have the display issues over the last week. I have compared all the settings for both accounts and they are the same (except for addresses). How can i get the inbox to show all 32 emails

This is the message I get when it does not go. I contacted Spectrum and they told me to check Thunderbird.

Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: p-impout004.msg.pkvw.co.charter.net cmsmtp 73.238.167.193 blocked. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes for more information. AUP#Out-1130.

First, thank you for your work with Thunderbird. I am on Thunderbird portable esr update channel. I connect to work email outlook. How do I manage a transition given that Microsoft will stop ews on October 1? Is there a new version of Thurderbird that will be released through the esr update channel to allow connectivity to Outlook? With thanks.

I changed my password in my Juno account and have logged in via a browser with the new password several time. But Thunderbird attempts to connect continue to fail. I deleted the old password in Thunderbird in the Privacy & Security section thinking it would update when the new password works - unfortunately, it never works. I reviewed all the Juno settings in Thunderbird and they are all consistent with the Juno Support recommendations. Now what?