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I have two issues that are related to a buggy interaction between Thunderbird and Microsoft's email server.

Issue (1) When I send an email with my Outlook email address (from the Android app or from outlook.live.com, but not Thunderbird), my email address shows up as a jumbled mess in the sent folder on Thunderbird.

It appears to the effect of

IMCEAEX-_O=FIRST+20ORGANIZATION_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+XXXXXXXXXXXXXXXXX+29_CN=RECIPIENTS_CN=XXXXXXXXXXXXXXXX@sct-XX-XX-XXXX-X-msonline-outlook-6f06c.templateTenant

(I have masked some potentially sensitive information).

In the sent folder on my Outlook Android app, my email address looks normal. It also looks fine on a browser in outlook.live.com. However, it's in the sent folder on Thunderbird that my email address is a mess.

Issue (2) When my Outlook email address is involved, the sending and receiving email addresses in the "correspondent" field are swapped in Thunderbird.

There are a couple situations where this swap happens:

1. Sending an email with my Outlook email account (either through the Android app or outlook.live.com, but not Thunderbird). In my Outlook sent folder on Thunderbird, the "correspondent" field shows my jumbled email address and not the receiving address, such as bob@gmail.com. Likewise, In the inbox of the receiving email account (such as bob@gmail.com) on Thunderbird, the "correspondent" field shows bob@gmail.com and not my Outlook email address.
2. Sending an email with any other account in Thunderbird to my Outlook email address. In my Outlook inbox on Thunderbird, the "correspondent" field shows my Outlook email address (this time unjumbled) and not the sending email address. However, in the sent folder of the sending email account in Thunderbird, the "correspondent" field shows up correctly (i.e., my Outlook email address).

These two issues are perplexing and probably related. Thank you for any help!

Have 5 email addresses with 2 different servers on my Thunderbird account...2 addresses with "maine.rr.com" and 3 with "gmail". Have no problem with the "gmail", but if try to make a "reply" to any "maine.rr" mail it is "server" rejected with message to "check SMTP settings AUP # Out-1500 and verify email address is correct in account settings". Have gone to account settings but cannot find. How so I resolve?

Can I have my Thunderbird email account on my desktop computer and on my laptop simultaneously? I want to continue using my desk top computer for email, as I always have. But I also want to take my laptop with me on a cruise so I can send and receive email while I'm away.

OK, I give up. As far as I know, my settings for TB for Android are the same as TB for Windows. However, I have 1300 emails in the Inbox in TB for Windows (and can search them), but only about 20-30 in TB for android (hopeless for a search). What am i doing wrong?

Hi, it's many year that I moving manually messages to folders located on a NAS. Everything has always been fine, but today I've discovered that, despite searching funcion is regularly finding all the messages, if I try to open them they show a blank body (see image attached)

Greetings, I have Centurylink for my Internet Service Provider. They provide my internet service and email. I have been using Thunderbird for many years and know it quite well. My issue is this. About a year ago Centurylink had a major update with it's services. Since that time I've been having issues using Thunderbird for my e-mail. I'm currently using the 139.0.2 (64-bit) release.

Getting e-mail using Thunderbird is very slow and sometimes nearly impossible. I have to open the Centurylink e-mail and get caught up on e-mail using their e-mail service. They also want me to start paying for the e-mail service through Centurylink.net services.

Another anomaly is any sent messages I send using Thunderbird will not post to my Sent folder in Thunderbird. I use IMAP because my Desktop and Laptop share the same e-mail so I can have those readily available on each. I have been through all of Thunderbirds settings multiple times chasing a remedy to these issues without any results. This is very frustrating!

If I delete my e-mail account from Centurylink.net and attempt to use Thunderbird solely, would this be something you would suggest? I'm not familiar with how to SAVE Thunderbird e-mail files when changing ISP's or where the information is saved. That is very important to me before attempting too many changes in trying to find a temporary remedy to these issues.

I'm trying to hold out for any big changes for another year, due to getting fiber brought into our area and access provided to all customers in the next year.

I'm very excited about Thunder having e-mail provided exclusively. However, not seeing any target dates for this service, I'm trying to put off having to jump through two or three changes until our fiber is available.

Any help and suggestions would be greatly appreciated! Thank you in advance for the help!

John N. Miller

PS. I have just donated another $20.00 toward Thundermail and Thunderbird Pro projects.

I have a couple of hundred filters and one of them occasionally kicks in and unexpectedly moves certain messages to a new folder but I can't figure out which filter it is. Rather than me going through every filter manually, can't Thunderbird tell me which filter affected a given message? I'd like to be able to right-click a message and be shown the exact filter(s) which affected it.

I have combined thunderbird and gmail, and it works different at my 2 pc.s, but that is ok.

But my original thunderbird relays on yousee and the adress from yousee.

What if I skip yousee?:

Can i still keep the email address from yousee to continue this combination?

I want to keep it, (the adress) if possibly, but not yousee??

This is the question ?

--,

Other words, not questions:

I must say: The configuration and the userfriendly way Thunderbird runs at pc is the very best - also the way You can mail to a group and answer between each other and all ( not easy in gmail)+ the way you can make maps= The worlds best.

But there are too many problems with yousee at the mobile, therefore I am thinking about shipping it.

( I also have Thunderbird at my mobile, but some new spams here, which does not shows up in Gmail or Thunderbird ...at pc.s) --- Best from Denmark/ Kib

Updated from 138.xx to 139.02 today.

Archiving from either of my two feed (RSS) accounts doesn't work right. I click archive button, instead copies to the archive folder of first email account in list.

Used troubleshooting mode to disable addons, still happens. Saw nothing in changelog to explain this.

A bug?

Since 5.18.2025 I get a "no message found" in my sent folders and other folders. "Find" will still find the messages and they can be opened, but I can't get the email folders to display. I know they are still there. Version 128.10.2esr. How can I get them to display in the folders?

Can I use Thunderbird to build an incremental local backup/archive of all messages transiting (incoming/outgoing) a webmail account ?

Any idea how to achieve this ?

My problem is:

• A POP3 account will miss all folders except the Inbox. (It's a pity that POP4 has not gained traction yet.)
• An IMAP account creates a mirror, not a backup. Remote deletions in the webmail account must not delete messages from my backup and vice versa.

detailed requirements:

• one-way sync only, since a local backup/archive must be built, not a mirror (two-way synchronization):
• Remote deletions must not cause local deletions (otherwise it would be a mirror, not an archive/backup).
• Local move/delete operations must not be reflected back to the mail server.
• Read‐only access to the mail server: no moves, deletes or flags remotely.
• All messages in all folders must be included in the backup: Inbox, Sent, custom folders, etc. Since POP3 can only back up the Inbox, I will probably have to settle for IMAP to include all folders.
• No duplicates: Messages must not be stored locally more than once.
• Messages must be stored as full offline copies locally (not just headers).

After the last update to Thunderbird 139.0.2 on a windows 10 computer, the write button doesn't work. When I click it nothing happens. I receive messages and can even reply to messages I just can't write new messages. The error console shows an error: 1750426957343 addons.xpi WARN Checking C:\Program Files (x86)\Mozilla Thunderbird\distribution\extensions for addons UnknownCollectionError: Unknown Collection "thunderbird/moz-essential-domain-fallbacks"

   UnknownCollectionError resource://services-settings/RemoteSettingsClient.sys.mjs:189
   sync resource://services-settings/RemoteSettingsClient.sys.mjs:635

EssentialDomainsRemoteSettings.sys.mjs:110:15 UnknownCollectionError: Unknown Collection "thunderbird/url-parser-default-unknown-schemes-interventions"

   UnknownCollectionError resource://services-settings/RemoteSettingsClient.sys.mjs:189
   sync resource://services-settings/RemoteSettingsClient.sys.mjs:635

SimpleURIUnknownSchemesRemoteObserver.sys.mjs:114:15

I think I have turned add-ons off and still have the problem.

hello I left account A (Google) and I am mainly using account B (Google) now. However, when I search for the mail of account A, it only shows the result, but after clicking it, it shows that there is no mail. How can I recover it? This is because the most important mail is in account A. PLEASE HELP ME....

Hello!

We use some filters in thunderbird to manage messages redirection to other mail-boxes. When message body contains any image, it disappears after redirection via filter rule.

When you forward same message to the same person by hands - works great, nothing is missing.

Can you help with any suggests / advises for thunderbird client config to fix this?

We use Thunderbird 115.5.0 (64-bit).

Thank you.

I know this question has been asked before, but haven't been able to resolve the issue - I have in my Trash folder, the Spam and Draft folders there, no idea how they got there. I use multiple computers and have the same issue on all. I am running Thunderbird 128.11.1esr (64 bit) on my desktop, which is Linux Mint.

If there are any suggestions on how to move the folders back to their original location, would be good, unless I have to now live with it.

Thanks, V1King

On my new laptop (Acer Aspire) I set up my gmail account without a problem, but T-bird will not set up my business account (on my domain, hosted by midphase/stackmail). I used all the settings from my t-bird account on my old laptop, but nothing I try works. I get a yellow box with the message "Unable to log in at server. Probably wrong configuration, username or password". I also tried lettting Thunderbird find the settings; they didn't work either.

What next?

I was moving stored emails between folders. After many moves, when moving a group, the move failed with message "TOO BIG" APPEND  ??. Since then, I have been unable to move or copy even single emails. How can this be cleared?