Thunderbird Community Forum

Good day support team, I had this sending message error show on my Thunderbird desktop when I try to send Annual Report to my members. I had tested to send through Bcc to 50 recipients and not sure how many is going through or not even one is going through. This is due to the over limit of the recipients I send through Bcc or recipient "bcl5157@gmail.com" account as show on the attached screenshot picture had problem? For this scenario, is it better to create a Mailing list instead?

Thank you in advance.

Regards Jim

I keep getting emails like the one below. How can I stop Proofpoint from blocking emails like this? I can't get any response from Proofpoint.

Thank you.

Subject: Mail delivery failed: returning message to sender Date: Mon, 23 Mar 2026 15:32:49 -0400 From: Mail Delivery System <Mailer-Daemon@server240.web-hosting.com> To: [edited]@unexpectedwildliferefuge.org

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

[edited]@marshallsterling.com host mxb-00261401.gslb.pphosted.com [148.163.148.189] SMTP error from remote mail server after initial connection: 554 Blocked - see https://ipcheck.proofpoint.com/?ip=66.29.141.68

I'm trying to list future events in the T-bird Calendar without including my numerous daily reminders (mostly when I'm supposed to take my meds). Is there a way to suppress their inclusion? Or is there a way to enter daily events as a separate class that won't show up in the standard future events list? Thank you.

I have been trying to add new email accounts to Thunderbird and they never complete the process (I have several that configured correctly prior to this error). I have tried both automated methods (With and without HUB) and the manual method of adding an account. Here is what is happening. When I add an account, I can watch Thunderbird login to the account on the status line. The login goes correctly, however the "Done" tab is always greyed out, the process never completes. I then try configure the account manually at the same screen and I get "the server is already in use" message. I believe that Thunderbird is not correctly closing the connection, leading to the "server is already in use" message, but I am not sure how to correct the issue.

Athough you advertise Thunderbird as a free product, your website does not allow me to download it unless I first pay. I am unwilling to pay until I have been able to test the product and verify that it will do what I need it to do.

Using TB 140.8.1 esr(64 bit) on Win11 Home desktop. My internet speed: About 40 Mbps up and down. All routine Win and TB updates installed when available. No changes in configuration, accounts, settings etc. except installing routine updates to TB and Win11. No problem with sending/receiving email. Sent mails go out immediately and appear right away in my sent folder. No problem receiving USENET news new postings to subscribed groups. I'm subscribed to 3 groups, using news.eternal-september.org. It used to be that when I wrote a reply to a post in a thread the msg would be sent within a few seconds. Recently and consistently, when I post to a group, pop-up notification tells me msg is being assembled. But progress appears to stall and msg often takes an hr. or more to appear in sent folder. Sometimes, it never appears in my sent folder but I can see it was sent because subsequent new postings to the same thread often cite my text and/or reply to it. My sent configuration: outgoing server: smtp.gmail.com port: 465 user name: my gmail email address - which works fine using google's web interface or TB authentication: OAuth2 connection security: SSL/TLS Any idea what's wrong? Any suggestions what to try to get back to prompt processing of sent postings to subscribed USENET groups?

For years I have had 4 email addresses using Thunderbird to access email from Yahoo AT&T currently.com email (@att.net) using Oauth2. In early March, two of the email addresses stop working. For one of the email addresses I was able to login to Yahoo mail using the User ID and Access ID and establish a new Secure Mail Key. I then went back to Thunderbird and reentered the email address with the new Secure Mail Key and was able to reestablish connection. For the second email address, Yahoo mail locked me out. I have tried to contact Yahoo support for 2 weeks by filling out their forms and have not received a response. Also I do not have a Recovery Email address. Any suggestions ?

I am looking of the name of a address book I added. I know the\at the main book is called abook.sqlite. I have other sqlite files called abook-1.sqlite, abook-2.sqlite and abook-3.sqlite. What are these file contain? Also where are the other info like "Notes" stored? Are they also in the abook.sqlite file. I am using a DB browser and i don't see that info in the file.

hi I have a mail adress rodeo1958@gmx.fr on caramail all is working but if I add a mail account it does not succeed , : problem of identifier or password... what happen ? i have check the email and pass both are right. thanks for helping me ... marc

• OS Version: Microsoft Windows 10 Professional (x64) Version 22H2 (build 19045.6466) • Firefox 148.0.2 (64-bit) • Thunderbird 140.8.1esr (64-bit)

In my email files (left pane) I have an ARCHIVE file (the good one), but also a second one (the one I can't delete); please see image attached.

Note the second one has a grayed-out icon which is different from the good ones. How can I send that file off to OblivionWorld?

Thank you. Appreciated. Nels

Since the firefox upgrade of March 4, 2026, I have lost all of my old emails in my inbox. These are important items I need to work on before I complete and file away. I need to gain access to them ASAP. Thank you.

For some reason, Thunderbird is prematurely word wrapping (or inserting line breaks) on emails that are sent.

I'm using default 'HTML Style' Defaults, but have also messed around with those to see if I can fix the issue - to no avail.

I found an old 'question' on the support site where this seemed to have been resolved (https://support.mozilla.org/en-US/questions/1307490). Unfortunately, the Solution doesn't appear to apply to modern Thunderbird versions (e.g., version 148); I can't find the suggested setting to change.

After downloading and running installer (Thunderbird setup 148.0) from Thunderbird website, Thunderbird opened as usual, showing my three email accounts. The 2 accounts I use for almost everything are both Yahoo accounts (yahoo.co.uk and rocketmail.com). But.. neither of these accounts will work without a yahoo sign-in pop which is pre-filled with an account name (example graphic attachment : thunderbird01red.jpg). 1 example shown but the same thing happens for both yahoo accounts.

The 'Next' button, which I assume will ask for password, does nothing.

I have attempted login via webmail. I enter account name, am asked for password and Yahoo insists on sending me a verification code - to the other yahoo account (the yahoo.co.uk account), which I cannot access! I then attempt to login to the other account to access my pass code and the same thing happens in reverse, telling me that a verification code will be sent to the first account.

Via Thunderbird, which has for years done all this automatically behind the scenes, I can get absolutely nowhere. Via webmail, I am in an 'impossibility loop'. I have cleared cache for each account.

Why won't Thunderbird allow automatic account login, as has been the case since the year dot. These are the 2 accounts around which my entire life is ordered - can somebody please help.

All of a sudden, i can not log on to my email accounts. I get a "failed" message for all 3 accounts. I get this message. Login to server mail.westpeake.com with username redacted@westpeake.com failed. Brian West www.westpeake.com