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My email provider provides "Disposable Email Addresses" - aliases which still direct mail to my inbox but don't expose my primary email to any web sites etc. I provide them to. It's very handy for registering for mailing lists, product vendors etc. since if one gets leaked, it's no big deal. I can drop the email again, but at least I know who was responsible for leaking it (I still get spam to my old Myspace account). My problem is that I'll occasionally have a need to reply such an email, and by default my From: address is my primary email address, not the one in the To: header. This is confusing to the recipient (since it's from some unknown email) and also exposes my email unintentionally. Is there any way to configure Thunderbird to always reply using the To: address? If there are multiple To: or CC: addresses, it could perhaps be specified with a wildcard matching any of my aliases. I can do it with Identities, I know, but I have to set that up before replying and I frequently forget.

Hi, I can receive emails (via satellite internet) but not send. I logged on to my email provider and I can send emails from there but not from here. any ideas?????

I just started using Thunderbird about a month ago having switched from Gmail. I've tried to forward a few emails to my personal gmail account but they are not going through. Any suggestions.

This is the error message I get when trying to download email

Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.

All my other emails work fine, same computer same "Local Folder"

I live in Germany and use t-online for my email. I can receive emails but not send. I have tried to fix it myself but nothing I do has worked. I don't understand all the technical stuff, so this is maybe my problem. Can anyone help me? PLEASE

Maybe there is someone near me in Germany (Obertshausen) by Frankfurt that can Help. I speak German so this would not be a problem.

This just all the sudden started happening for my charter email account, I haven't changed any settings, the font turned red and can't receive the emails. I have mail washer and see the emails, they not from anyone shady. got a couple screen shots. Thanks

When left clicking the "get messages" button, nothing happens, no synchronization or status bar of importing shows up. The only way I can synchronize mail is to right click and select "get all new messages". Is it intended to be this way?

I have a number of pop3 accounts with the same mail host, but suddenly one of them gives me the message "Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox."

I use Thunderbird on two Windows machines, and the problem is on both, so it is something in the interaction with the server, however, there is no problem accessing the mail via webmail directly on the server.

I have tried to change password on the account, but the problem did not go away. In fact, I got the box to tell me that the old password did no longer work, so I know that the problem pops up after log in to the account. Before the error message appears, the message "downloading 208 messages" (or something similar) briefly appears.

Is there a way to find out exactly what fails?

I have about 19,000 + emails in one of my email accounts , I do not want to delete all of them , just select groups , like for example I have about 392 emails from Newegg , what I want to do is get all of them in 1 place (I did this using the Filter Emails) , then I want to delete them all , but I don't want to delete EVERY email I have stored

I tried but I couldn't find any way to do a mass delete , like a Select All , Delete , I couldn't even find Delete unless it was for each email , which would take forever to sort through 19,000+ emails and delete the ones I want deleted , but leaving the rest

Is there any way to do this ?? , or is there a reason this has not been implimented ?? , it seems like a no brainer , basically my email is running slow , so when I click delete on a email , there is a pause before it deletes , I am assuming because of the backlog of emails (already read) that I have in my Inbox that I didn't delete at the time , and now have literally thousands of them

Basically what I was hoping for is to be able to take say ALL Newegg emails , and put them together , then do a Select All and Delete , but I couldn't find any way to do this , that way I get rid of the ones that have expired , but keep other emails from other people/buisnesses and just do Selective Mass Deletion

Thanks ... Jim

Hello, I’m having the following problem: When I try to add my Outlook email address to Thunderbird for Android, I get the error "Authentication unsuccessful: SmtpClientAuthentication is disabled for the Mailbox." This points to a help article that only describes a procedure using PowerShell—requiring domain admin privileges, which I don't have. Setting up the IMAP incoming server seems to work fine, but the outgoing server refuses to connect. This is just a personal account. The configuration is: Server: smtp.office365.com; Security: StartTLS; Port: 587; Authentication: OAuth 2.0; Username: mymail@outlook.de; Client certificate: None. I also tried the configuration using the server smtp-mail.outlook.com (with otherwise identical settings), but I get the same error. Does anyone have any advice?

When all the comcast accounts migrated to yahoo, there wasn't supposed to be a change but I cannot send or receive messages through Thunderbird. I deleted my old passwords and tried to use the one that works at yahoo but it is not working.

Apparently I also have 3 thunderbirds running on my machine .  I don't know how to get rid of the old ones

I also got an error message that says 151.0.4 is not compatible with 151.0.3

I set up a filter to move messages to the junk folder. If it's not from a .com, .net, or .org domain, move it. Here's how I set it up... If the "from" incoming message doesn't contain "any of the following" ".com" ".org" or ".net" move it to "junk". It moved .com and .org messages to junk anyway. What did I do wrong? There are too many TLDs to create a filter for all of them.

I have three separate Yahoo email accounts. I set up Thunderbird to link to each Yahoo email account separately. It worked fine for a year or more. On 5/25/26 one of the three Thunderbird email accounts stopped downloading emails from Yahoo. I could see at the bottom bar Thunderbird indicating that is was downloading 1 of XX emails, but never actually downloads them. There is no error message. I checked the Yahoo email account to verify the number of emails I am missing from Thunderbird and the number is correct. I can see the emails in Yahoo. I'm the only person using Thunderbird, so no changes have been made to previous settings for retrieval. I confirmed Security and server settings for Thunderbird in and out going emails, and Yahoo are correct. I tested the connection in Thunderbird, and the connection is successful. I tried to send an email from the Thunderbird account having issues, and the email was sent and received by the recipient. The recipient replied, and Yahoo received the email, but failed to download it to Thunderbird...along with all the other emails since 5/25/26. I unlinked the account and reestablished the link between Yahoo and Thunderbird, and still not fixed. I tried restarting the computer, with no change. I tried to send an email from Thunderbird to one of the other Thunderbird emails and it was sent and received. I made changes to Thunderbird to force the download of emails, and it still wouldn't do it. I turned off my antivirus, closed Thunderbird, and restarted it, and that didn't change anything. The capacity of emails on the email in question only has 739 emails, so it's not over the limit and I have plenty of storage capacity. Thunderbird is set to save emails, Cookies and cache were cleared, no change. I ran the folder repair feature in Thunderbird, but there was no change. I compared all the settings between the other Thunderbird emails that are working against the one that isn't, and they are all the same. There was a suggestion to close out of Thunderbird and delete the "Global-message-db.sqite" file from the Thunderbird profile in case it was corrupted, and it would recreate this file when Thunderbird was restarted. The file was recreated, but it didn't fix the problem. There was mention that a suspicious email in Yahoo might be blocked by Thunderbird, so I placed various emails in the spam folder, and it didn't work. I did find one email in the Yahoo spam folder that was dated before 5/25/26 and moved it to the Yahoo inbox. Lo and behold, that one email downloaded to Thunderbird. So there is something within Thunderbird preventing emails from downloading after 5/25/26. I've read many people complain about similar download failures with no solid fix. Someone mentioned it fixed itself on a day, but then stopped again days later. Someone else mentioned Yahoo changed its password protocol to transfer emails, but that doesn't make sense since the other two are still downloading based on the "old" password protocol. I'm at wits' end. Thanks for reading all of this. I hope someone has a solution.

Hi I am Unable to send e-mails (only receive) after adding a 3rd account to my thunderbird, a microsoft e-mail (the other 2 are gmx and my old work e-mail). This is my private laptop. I tried tons of troubleshootings incl. deleting passwords, triple checking all settings (they are all correct), but I always get a pop up with "Login to server smtp.office365.com with username ... failed" when trying to send an e-mail. When I click on enter new password it just tries to send the e-mail again, which fails, so unable to enter anything.