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Outgoing email message states: Sending of the message failed. The message was not sent due to exceeding the allowed number of recipients. The server responded: Insufficient system storage.

I'm using Thunderbird 140.6.0esr (aarch64) on a 2024 14" MacBok Pro running MacOS 15.7.3 (24G419).

I manage fourteen email addresses, with most of the traffic going to one primary account, either by direct addressing or forwarders from others of the addresses. Maybe not the most efficient setup, but it means I don't have to scan 14 different inboxes to find the messages I most need.

I currently use ±89 filters on this primary account to file messages in a LOT of mailserver-based folders, and a few folders on the laptop. ±90% of the traffic gets filed in server-based folders so I can use any device to access message history. (I should probably note that these filters and message-threading don't always play nice together.)

For a long time, one of the message filters I'll call "Filter BS" successfully filed specific messages in "Folder BS," a server-based folder 2 levels below the inbox. Folder BS also has 2 levels of sub-folders within it for annual and monthly filing.

Some time ago, I began to have problems with messages of many kinds (subjects/sources/etc.) going missing. Eventually, I searched and found them in Folder BS. In response, I deleted Filter BS, looked for but didn't find other filters responsible for these unexpected results, and managed incoming BS-related messages manually. But despite Filter BS having been deleted, non-BS-related messages still get "lost," meaning incorrectly filed in Folder BS, which is acting like a rogue black hole, sucking up everything that gets too close. I have not been able to identify any criteria for what turns up in Folder BS beyond "lots of stuff that doesn't in any way belong there."

Speculating that something's "off" with the BS folder's directory in a way that would be nearly impossible to fix, I'm trying to figure out the least inconvenient, least risky way to solve the problem.

Not knowing other ways I might compound the problem by making big moves with the MANY messages archived in the BS folder's 7 annual subfolders and their 12 each subfolders; and not knowing how to back up server-based in-box sub-folders, I'm stuck at an impasse.

How should I proceed?

Thanks in advance for any input.

I am not getting specific emails from ' Marcie Tilton Fabrics' . She sends 2 per day. I haven't gotten them for a couple months. I WANT THEM! I've called her company; I've resubscribed.

They are not in my bulk file.  Where are they?

They do not appear on my Thunderbird (PC- Mozilla), on my I-pad (Apple), on my phone(Samsung)

I hope you can help.

Why are older emails disappearing from the Inbox? It didn't do this when I was using Windows 7SP1. Now I have Windows 11 and it seems the Oct and Nov emails I had have disappeared. Only Dec emails are in the Inbox.

Dear community members, Since receiving the Thurderbird release 140.4.0esr on Oct 14th, I have not been able to send email from any of my accounts (2xIMAP and 3xoffice365 through OWL). Nothing has changed in the account settings. Receive works ok. The usual easy fixes do not seem to work (restart, firewall switch-off, etc.). Any ideas beyond having to rewind to an earlier version and rebuild the whole thing (hopefully not!)?

Version 140.4.0esr Build ID 20251010020716 User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Thunderbird/140.4.0 OS Darwin 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:30 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6020

Thank you for your help! Heli

I am using TB 140.7.0esr(64bit) on a windows 11 desktop/ Starting 15 Jan at ~ 8pm, my outgoing SMTP email from multiple tds.net email accounts through my default server (tds.net) is failing with the following message: "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Cannot connect to SMTP server 129.159.94.43 (129.159.94.43:587), connect error 10060." The outgoing SMTP configuration is: "Server name: mail.tds.net Port: 587 User name: john.randle Authentication Method: normal password Connection security: STARTTLS" I have not made any changes to that configuration. I am still able to send SMTP by switching to another email account/server (e.g. gmail.com). I have contacted tds.net and they say, not surprisingly, that it is an email client (thunderbird) issue. I am getting the same error on another desktop running windows 10 with TB 140.6.0 esr (32bit). Any suggestions will be appreciated. Thanks in advance.

Hi there! I and my colleague encounter some bugs with Thunderbird and we would like to seek your advice in regards of the issue.

1. <user a@citizen-systems.com.hk> was supposed to get a cc copy of the email sent by <user b@citizen-systems.com.hk> at Mon, 12 Jan 2026 09:35:19 +0800 but it never reached. The receivers, namely <user c@systems.citizen.co.jp> and <user d@citizen-systems.com.hk>, however, were able to get the mail. <user d@citizen-systems.com.hk> and <user a@citizen-systems.com.hk> are working at the same office and under the same network. Network provider checked the protocol, router, traffic and firewall are working as normal.

2. <user e@citizen-systems.com.hk> found a number of emails that she kept at "Inbox" disappeared on 12 Jan 2026 morning +0800.

She is unable to find it anywhere at her whole mailbox but has to ask the senders to resend them to her.

It would be very much appreciated if you can check and advise how to prevent the issue from happening again.

(PII redacted by moderator)

If I begin typing while before I begin a new message, sometimes a message will disappear and I can never find it again. For example an "A" will move it to the archives. But whatever letter I press, the message disappears. It's not in archives and not in trash. How do I find it again?

Hello:

I am unable to send email messages to any "@zianet.com" email accounts (New Mexico). I can receive Zianet email messages, but I cannot Send or Reply. Zianet says they recognize the Earthlink IP Address, but that there is a third sender's IP Address they don't recognize. Earthlink says they have given Zianet the IP addresses. Does Mozilla Thunderbird have a third IP Address I can share with Zianet Tech Support? Zianet's phone number here in Las Cruces, New Mexico is: 1.575.353.1234. This issue is causing a lot of problems for me and my business. Thank you so much.

Here is the error message:

Delivery has failed to these recipients or distribution lists:

Server "zianet.com" returned an error:

* [hpollard@zianet.com]: message reached max retries

Authentication-Results: earthlink-vadesecure.net; auth=pass smtp.auth=jeanfulton@earthlink.net smtp.mailfrom=jeanfulton@earthlink.net; Received: from [192.168.10.102] ([67.143.180.56]) by vsel1nmtao01p.internal.vadesecure.com with ngmta id 48c82eca-188a1cab439a7dda; Mon, 12 Jan 2026 22:35:32 +0000 Message-ID: <35210bba-27ea-40e6-858d-5d16b6b6d300@earthlink.net>

Optus (Australia) emails can't be sent or received by Thunderbird on my PC via my Optus wifi internet connection. I can use emails on my phone via mobile data with wifi turned off (different email client on the phone, though). Optus checked all the settings on my PC with me and they are all correct. They insist that it is a Thunderbird issue (doubtful, IMHO) and that I contact you. Is there an issue with Thunderbird connecting with Optus email? If so. is there any resolution to the issue? If not, can you confirm no problem from your end so I can get back to them (again!)

Thunderbird does not import current messages from Gmail, it lags several hours behind. For example, Gmail will show new messages arriving at 9 am but Thunderbird shows most recent messages arriving at 12 am. I have checked settings and it seems like syncing is set correctly. Google Pixel 9a, Android v16.

Hello everybody. Since today or yesterday, my Thunderbird has stopped refreshing the list of messages. The number of new/unread messages in the Inbox and other folders is shown and updated right but the main window with the list of the messages does not get refreshed and only shows the last message from couple days ago.

I've tried to follow a bunch of guides and ideas (repairing folder, deleting .msf files...) and even removed the account and tried adding it again. The list of folders is right but now there are no messages at all. All folders look empty.

I've found out that in the folder on the disc where there are supposed to be the "INBOX.msf" and "INBOX" files, that the "INBOX" file without the file type is missing. And it's the same with every message folder, there are only .msf files on my PC where I removed and re-added the account. On my laptop, the "INBOX" file still exists but does not get updated.

This thing is happening with only one of my e-mail accounts, the others get updated fine and new messages are shown. It is IMAP server, imap.atlas.cz, Port 993, SSL/TLS with a password.

Can anyone help please?

i am crying here i have changed my password for Comcast several times but i think ih ave screwed up The smtp server i am not sure wast do do there this is what i have can yu please tell me what to do please help i t will not et me send please

It seems that after updating to the latest version, Thunderbird is not displaying new emails. The numbers of new emails in the folders are changing, but the emails are not loading. I performed maintenance on the folder, but the emails disappeared and I no longer have any emails in my Inbox. I use IMAP, everything is OK on my phone and on the web. This is happening with Thunderbird at home and at work.

Translated with DeepL.com (free version)

Hello, I've been happily using Thunderbird for a few years now. Since yesterday, I have been unable to send emails in Thunderbird, but I can receive them. I can send emails directly through my Skymesh Webmail, but in Thunderbird when I try to send an email, I get the following notification, even if I am sending it to only one recipient. Sending of the message failed. The message was not sent due to exceeding the allowed number of recipients. The server responded: Insufficient system storage. Please help. Regards, Judy Osborne 15th January 2026 [edited from public] @bordernet.com.au

Hi im trying to setup auto filtering for my IMAP account. The IMAP account already moves files to subfolders. But i still need to apply my custom auto filtering to them aswell.

This old post (https://www.thunderbird-mail.de/lexicon/entry/70-filter-erstellen-und-verwenden/) says it works with `mail.imap.filter_on_new` set to true. (It does not work for me!)

While this newer post (https://support.mozilla.org/en-US/kb/organize-your-messages-using-filters) says it doesnt.

Am i doing things wrong? Is it bugged? Is there no way to do it?

Thanks in advance! :D