See: https://support.mozilla.org/en-US/questions/1465555#answer-1676802

Those are the settings I use. Quite a few people seem to have trouble getting them to initially work.

Thanks! But as I say, those are the settings I have ... I just get the login failure message every time I try and send an email :(

I've tried closing and restarting Thunderbird; rebooting the PC. I am on Windows 10 and everything is up to date ...

Oh, and the RESET PASSWORD doesn't do anything on the error message as well - I'm not asked to re-enter the password ... it sort of feels like a Thunderbird bug ...

David

Do you know specifically what version of Thunderbird you upgraded from->to?

Hi Corey - The Update this morning (22 Sept) was to Version 128.2.3esr - Nebula - which I note was released on 20 Sept (we've been away and so it didn't update until this morning).

I was on Version 115.15.0esr ... installed 8 Sept

(I found the Update History :))

Does that help?

David

what "other" smtp servers do you have? Is the outlook/Office one mentioned in other SMTP servers in account settings > outgoing servers (SMTP)

My observation is folk assume incorrectly that Thunderbird will only use the SMTP server specified in the identity part of their incoming mail account. Yjis is not the case. Others assume the "default" will bhe used and that is not the case either. Which SMTP is selected is a relatively complex equation based on what folder you have selected, what identity you are sending from and can include directives from certain addons. SO you can assume basically nothing

Hi Matt

I *think* I understand the Thunderbird SMTP server thing ... just not why it's not working ... but your note suggests it's more complex and nuanced ...

On the ACCOUNT SETTINGS list for the two different MS accounts in question, there is on the 'top' level a field at the bottom with OUTGOING SERVER (SMTP) on it ... this has a dropdown to all the SMTP servers on the TB installation. So I have ensured that the one selected there is the right one for the account - it's not just the default one.

And the one that is selected has all the details as mentioned up top in my first note.

You can also see all the different SMTP servers in the TB install at the very end of the list at the left of the ACCOUNT SETTINGS tab ... and basically you can edit/change them from there if you want to, or you can also edit them from the selection list within the details for a specific account.

Is there something else which needs amending here? As I say, there are actually loads of SMTP 'accounts' in that list, I assume all from various additions of accounts to TB over the years.

The settings there I have for the two MS accounts that I'm trying to use are:

SERVER NAME: smtp.office365.com (but if I try and use smtp.mail.outlook.com which is what MS say you should use in their help pages, I get the same result - neither work) PORT: 587 CONNECTION SECURITY: STARTTLS AUTHENTICATION METHOD: OAuth2 USER NAME: the appropriate email address for the account

I can't find any other settings to change ...

As mentioned, my Gmail account is still working fine - it's just the MS ones which have stopped sending mail. I can still receive mail fine to all of them, and read it etc ... it's just when I try and send I get the 'Login to server smtp-mail.outlook.com with username xxxxx@hotmail.com failed' message (or the office365 server depending on which I use).

Oh, and you mentioned ADD ONS - I don't think I have any. None are showing as being there in the ADD ONS AND THEMES area anyway.

Thanks!!

David

Hi Matt

I *think* I understand the Thunderbird SMTP server thing ... just not why it's not working ... but your note suggests it's more complex and nuanced ...

On the ACCOUNT SETTINGS list for the two different MS accounts in question, there is on the 'top' level a field at the bottom with OUTGOING SERVER (SMTP) on it ... this has a dropdown to all the SMTP servers on the TB installation. So I have ensured that the one selected there is the right one for the account - it's not just the default one.

And the one that is selected has all the details as mentioned up top in my first note.

You can also see all the different SMTP servers in the TB install at the very end of the list at the left of the ACCOUNT SETTINGS tab ... and basically you can edit/change them from there if you want to, or you can also edit them from the selection list within the details for a specific account.

Is there something else which needs amending here? As I say, there are actually loads of SMTP 'accounts' in that list, I assume all from various additions of accounts to TB over the years.

The settings there I have for the two MS accounts that I'm trying to use are:

SERVER NAME: smtp.office365.com (but if I try and use smtp-mail.outlook.com which is what MS say you should use in their help pages, I get the same result - neither work) PORT: 587 CONNECTION SECURITY: STARTTLS AUTHENTICATION METHOD: OAuth2 USER NAME: the appropriate email address for the account

I can't find any other settings to change ...

As mentioned, my Gmail account is still working fine - it's just the MS ones which have stopped sending mail. I can still receive mail fine to all of them, and read it etc ... it's just when I try and send I get the 'Login to server smtp-mail.outlook.com with username xxxxx@hotmail.com failed' message (or the office365 server depending on which I use).

Oh, and you mentioned ADD ONS - I don't think I have any. None are showing as being there in the ADD ONS AND THEMES area anyway.

Thanks!!

David

Just out of interest, on a laptop, I tried a completely new install of Thunderbird ... it was not on the laptop before ...

And I added one of my Hotmail accounts.

And I get the same 'Login to server smtp.office365.com with usename xxx@hotmail.com failed' message when I try to send a message.

So this tells me it's not the PC I'm running on as it's happened on a 'clean' install to another device ...

It's either that Thunderbird is for some reason not supporting sending to Hotmail SMTP any more ...

Or that there's some issue with my Hotmail accounts - and I have checked the MS help pages, and checked what settings I have there ... and it all seems to match and be fine. They also work fine on my phone and through Outlook.

The settings in Thunderbird for the clean install are the same as the ones on the PC - this was set up on the laptop by using defaults etc - nothing has been manually touched or configured at all. So a clean install. Add the hotmail account, try and send a message ... fails.

Does that help track this down?

It's hard to believe that no-one else has this issue as it's so simple to create ... but I'm assuming there must be *something* in the config of my hotmail accounts (which I have had with the same settings for at least 20 years now) which is causing it ...

Can anyone help? Otherwise this is probably the end for me and Thunderbird which I have been using in various forms since around 1996 ... :(

David

David, I have the same problem. I have 2 hotmail accounts working fine with thunderbird since the last 10 years... I'm in Win10 and thunderbird is 128.2.3esr (64-bit).

Settings for income POP:

Server Name: outlook.office365.com
Port: 995 
User Name: XXXX@hotmail.com
Connection security:  SSL/TLS
Authentication method: OAuth2
and
Server Name: smtp.office365.com
Port: 587
Connection security: STARTTLS
Authentication method:  OAuth2
User Name: XXXX@hotmail.com

I tried in a virtual machine a new install but stills not working. I googled for 2 days triying everything I find but not work for me. The problem starts this week (but not in the same day in my 2 accounts).

Microsoft make some changes in my accounts that thunderbid didn't like it. Hope they find a solution.

Best regards

No further replies here ... and I still have the problem.

Everything works in Thunderbird but I cannot send emails to any MS account - Gmail works fine though.

I'm having to use Outlook now to send emails from, with Thunderbird to actually view and manage them (as it's a much better interface than Outlook) ... but it's a right faff ...

Does ANYONE know why emails cannot be sent from Outlook/Hotmail SMTPs?

David

Microsoft decided to alter stuff again and it's not just the Authentication Method. Everything now has to 'Authentication Method: Oauth2' Cookies must be allowed in order to set up the oauth2 token. VPN must be switched off otherwise server thinks you are trying to hack account. If you maintain a website and use a program like Apache Xampp then you must switch it off until oauth token has been set up because the process uses the 'localhost'.

Account Settings must use the following: Server Type: POP Mail Server

• Server Name: outlook.office365.com
• Port 995
• User Name: xxxx@hotmail.com
• Connection Security: SSL/LTS
• Authentication Method: OAuth2

Server Type: IMAP Mail Server

• Server Name: outlook.office365.com
• Port 993
• User Name: xxxx@hotmail.com
• Connection Security: SSL/LTS
• Authentication Method: OAuth2

SMTP:

• Server Name: smtp.office365.com
• Port: 587
• Connection Security: STARTTLS
• Authentication method: OAuth2
• User Name: example@hotmail.com

• Settings > Privacy & Security

Check under Web Content -

• Select: 'Accept cookies from sites'
• Accept third party cookies' 'Always'
• Click on 'Exceptions' button next to Accept cookies from sites to make sure you are not blocking cookies from Microsoft sites, such as :hotmail.com, outlook.com, office365.com, www.live.com, www.msn.com

Your microsoft account and your hotmail account need to have the same password. Info at this link says:

• https://support.microsoft.com/en-gb/office/how-to-sign-in-to-hotmail-c378938b-c0eb-40c1-b99e-338dd9e776a8

Can't sign in to Hotmail or Outlook.com? Notes: Your Hotmail or Outlook.com password is the same as your Microsoft Account password.

so please make sure they are the same - done via webmail account.

Then there is the case of the SMTP username = eg: hotmail email address.

When it comes to 'sending' - smtp in Thunderbird - it can only send using the 'primary' email address, so if you want to send using hotmail email address then make sure it is set up as the primary email address. You do this via the microsoft webmail account.

Once you have all these settings and got the password sorted.

Restart Thunderbird When you get the Microsoft pop up window asking for password, type it in and clickon 'Sign in'. You may then get another window asking to allow Thunderbird access to server - click on 'Accept'

To check:

• Tools > Developer Tools > Error Console
• Click on the top left bin icon to clear the console.
• Close Error console

Then try to send an email and wait for the failure. Open Error console

Post image showing contents.

If you see something like this:

mailnews.smtp: Command failed: 535 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant. Visit https://aka.ms/smtp_auth_disabled for more information

The link mentioned in error console : https://aka.ms/smtp_auth_disabled

That link goes to this location - I specifically include the info on 'enable smtp': https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission#enable-smtp-auth-for-specific-mailboxes

If you as a user are not enabled for SMTP then it fails - switch on SMTP. https://support.mozilla.org/en-US/questions/1464666?page=2#answer-1676928

IF you see something like the following in error console:

mailnews.smtp: Command failed: 535 Authentication unsuccessful [MN2PR05CA0041.namprd05.prod.outlook.com 2024-09-25T20:33:37.105Z 08DCDD14E4ECBF59]; currentAction=_actionAUTH_XOAUTH2 SmtpClient.sys.mjs:602:19

mailnews.smtp: Command failed: 500 Unrecognized command 'Length: 7' [MN2PR05CA0041.namprd05.prod.outlook.com 2024-09-25T20:33:42.231Z 08DCDD14E4ECBF59]; currentAction=_actionAUTHComplete SmtpClient.sys.mjs:602:19

This error message means issue with sending email address/username not matching primary. I asked user to check 'alias' email address. Some people may have a hotmail email address and also that hotmail account allowed some additional/alias email addresses. In outlook.com microsoft account webmail. You need to check what is set up as the primary and adjust if necessary. Apparently, smtp username in Thunderbird needs to use primary email address.

For more info and response from user who had problem resolved including images : https://support.mozilla.org/en-US/questions/1465652#answer-1680641

Toad-Hall you are a SUPERSTAR!!! I didn't know about the Error console, and I certainly wouldn't have known how to interpret the output.

My problem was indeed that the ALIAS on the MS Accounts was set to be PRIME for the address I actually wanted to use, rather than the 'base' MS email address ... Switching the MS one to be PRIME made the emails all start to send again!

My remaining question then, is how to get Thunderbird to use my 'Alias' email as the one that the recipient sees. I have tried changing the field in ACCOUNT SETTINGS - the Reply-to Address - but it doesn't seem to make any difference ... I have tried rebooting TB ...

SO THANK YOU SO MUCH!!!!! A simple solution to why it wasn't working ... dontcha just love MS!!

David

To clarify the last note ... did some more experimenting. The REPLY TO address does work - so if I reply to the email, it uses the correct ALIAS/REPLY TO email addy to reply to.

My concern was that in the email display both the FROM and CORRESPONDENTS columns show the base MS email addy rather than the one I specified in the REPLY TO.

Is there a way to 'spoof' the email so it seems to be coming from the Alias email rather than the base one? (IE I'd rather people didn't see the base MS email at all, and only saw my Alias one.

David