Diễn đàn hỗ trợ Thunderbird

I would like to setup Thunderbird as my email client.My email service is provided by Godaddy with an Outlook account. When I am at the incoming server settings, it has my domain name, not smtp.office365.com which I tried with both authentication options (below) and with my domain name, the protocol was IMAP. I changed the port from 143 to 993. I changed security from Autodetect to SSL/TLS. For authentication, there was not an OAuth2 option, I tried Autodetect and Normal password, neither worked. And I used my domain email password. with using my domain name, it came back with an error an suffixed my domain name with :110. It stated that this was not the correct domain and there was a security issue. It is not clear how I should progress.

I have checked the mail setting, they seem to be correct, but this is the message I get when trying to send from any of my email accts.

Sending of the message failed. An error occurred while sending mail. The mail server responded: Email rejected. Please verify that your email address is correct in your account settings and try again.

I use Thunderbird v 140.12.1esr to manage email on my email account frankn413@yahoo.co.uk. For the past 2 days sent emails fail with error message "sending of the message failed. The message could not be sent because connecting to outgoing server SMTP.mail.yahoo.com failed. The server may be unavailable or is refusing SMTP connections. I have not changed my smtp settings - they are Server = smtp.mail.yahoo.com; Port = 465; user name = frankn413@yahoo.co.uk; Authentication method = OAuth2; Conneciton Security = SSL/TLS

PLEASE BE PATIENT WITH ME. I am elderly, and am struggling greatly. Within the last week, I can’t send emails from my Mozilla account. I have a BT email address ie btinternet.com. When sending, it comes up with Login to server mail.btinternet.com wth username (my email address) failed. This is followed by Unable to authenticate to outgoing server (SMTP) Please check the password and verify the authentication method in account settings / outgoing server SMTP.

I was on the phone to BT for three hours yesterday and they were so lovely and patient, they set me up wth a BT email app, however all of my folders with my vital bits and bobs are on Mozilla. Please could someone help me

Cannot send email on Thunderbird suddenly. This happened after Thunderbird update on 7/16/26 or 7/17/2026. Also could not receive email on Thunderbird for two days after the update but that issue suddenly resolved itself after 2 days . Have tried to change the port but that has not helped. I use rcn.com We could not send or receive there either when I went on the server. Now rcn is working again on the server but cannot send using Thunderbird account.

Hi,

My godaddy webmail setting which I configured on thunderbird mail for my Mac Os is not going through anymore.

It was workng absolutely fine until for over a year and now since last week I do not know what is the issue.

Incomin mails work fine, I can see the sent mail if I have sent the mail from Godaddy Webmail, but the email send from thunderbird mail doesnt work. Checked all the settings. also tried switching Port from 465 to 587

Please help !!!

thanks!

win10/tbird v140.12.1.esr wont d/l from yahoo. logon appears ok but the d/l bar starts & then just times out. This just started 3-4 days ago. gmail & fastmail ok.

Martin Belonje

Jul 15, 2026, 13:24 CST

Goodday,

Unfortunately I could not add a screenshot to this message. Under my account [redacted]@zonnet.nl there is a "Postvak IN". This means inbox. In this inbox should new mails appear. Right now there comes nothing in it. However, two lines below there is suddenly another "Postvak IN 22". New emails appear here now. I already tried to drag this inbox into the inbox under [redacted]@zonnet.nl but that doesn't work.

New emails now appear with a yellow bar: The text in the yellow bar at the bottom says: (I translated)

No unique identity was found matching the sender address. The message will be sent using the sender field and the settings of the identity Martin Belonje <[redacted]@zonnet.nl>.

To my opinion this has to do with the fact that the inbox has moved from its original position.

I hope you can help me out.

Hello,

I'm currently using the thunderbird client to open a zoho mail account. I've set several filters (around 40) so that incoming emails are automatically redirected to the appropiate folder. If I click on the download/refresh icon (the little cloud with the downwards arrow), new email isn't received. On the bottom, a small message appears ("No new messages on the server" or something like this). You may think that that is precisely because I don't have new emails but if directly go into any of the folders and once again click on the download/refresh icon all of the emails that were supposed to go into that particular folder appear all at once (even mails that are 2 or 3 days old). Now every day I have to go into all of my 40 folders and click on the refresh button.

I look forward to your help. Kind Regards.

I have an hotmail.com account with no problems whatsoever while logging into Apple Mail, G-Mail etc. but when it comes to Thunderbird it does not let me login. I tried to login first to outlook itself, changing the servers ports etc. but nothing works.

For refrence my current server settings are: Incoming (IMAP): Server: outlook.office365.com Port: 993 Security SSL/TSL and OAuth2

Outgoing (SMTP): Server: smtp.office365.com Port: 587 Security: STARTTLS with OAuth2

I have about a dozen accounts with over 50 folders, most with a matching filter. About 100k messages, taking up about 1G of disk space. All but one account is merged under my Inbox to have fewer duplicate In/Draft/Sent boxes eating up window space. I'm using 152.0.1 (aarch64) Release branch on a Mac OS X 26. All are POP accounts on a DreamHost server.

At some point it started to show the draft message on every email, which means on incoming as well. I've had this phenomenon for years.

Recently filtering has started to not automatically run on some emails forcing me to run the filters manually. I've run the repair folder options which does not seem to make any difference.

Since switching to macOS 26 it also does not allow me to move Thunderbird child windows, they simply show up on the default location. But that's for another ticket.