Solved Problem connecting Thunderbird to Office365.com


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pokeefe0001

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In the past I've had no problem setting up email server accounts in Thunderbird - I have 5 active connections right now - but I'm having trouble connecting to Office365.com.
According to this web page I should use
Code: 
Protocol     Server name         Port     Encryption method
POP3     Outlook.office365.com     995     SSL/TLS
IMAP4     Outlook.office365.com     993     SSL/TLS
SMTP     Smtp.office365.com         587     STARTTLS
That worked fine for inbound -the IMAP connection works fine - but the SMTP connection times out.

I read the OAuth 2 is now required for these connections. I have no experience with it but I specified it and it worked for IMAP (as I said). I assume I'm supposed to use the same userid and password for both the IMAP and the SMTP connection (although I have no idea what is done with them when OAuth 2 is used). Thunderbird allows me to specify a different userid for the SMTP connection but I haven't seen that I need to ... and I have no idea where I can enter it's associated password.

I know nothing about Office365. Is it possible that IMAP is enabled for this account but SMTP is not?
Any ideas what I do next to debug this?

I don't know if it matters, but I'm running Thunderbird 128.1.
 

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in Thunderbird go to Account settings and at the bottom of the settings page open
Outgoing Server (SMTP)

highlight and then click 'edit' the Outlook entry which will open the server settings.
1735693869032.webp
change the port settings to 587 then click 'OK' to save.
here is a link to the required settings in Thunderbird.

Modern Authentication Methods now needed to continue syncing Outlook Email in non-Microsoft email apps | Microsoft Support

Modern Authentication Methods now needed to continue syncing Outlook Email in non-Microsoft email apps
support.microsoft.com support.microsoft.com

best of luck, Steve ..
 

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That's what I have (except for the User Name, of course). I'll keep digging.
 

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System One System Two

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    Windows 11Intel Core i5-840016GBIntel UHD Graphics 630
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    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Microsoft
    CPU
    Intel Core i5-8400
    Motherboard
    ASUS PRIME H370-PLUS
    Memory
    16GB
    Graphics Card(s)
    Intel UHD Graphics 630
    Sound Card
    On board
    Monitor(s) Displays
    Samsung SyncMaster 2043BWX
    Screen Resolution
    1680 x 1050
    Hard Drives
    Samsung SSD 850 256GB
    WDC 1TB NVMe
    WD 3TB external USB drive
    PSU
    I don't remember
    Case
    Corsair something-or-other
    Cooling
    Air CPU + 2 case fans
    Keyboard
    DAS S Pro (Cherry Brown)
    Mouse
    Logitech USB of some sort

  • At a glance

    Windows 10 21H1i5-840016GBon board
    Operating System
    Windows 10 21H1
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homegrown
    CPU
    i5-8400
    Motherboard
    ASUS PRIME H370-PLUS
    Memory
    16GB
    Graphics card(s)
    on board
    Sound Card
    on board
    Monitor(s) Displays
    Samsung SyncMaster 2043 BWX
    Screen Resolution
    1280 x 1024
    Hard Drives
    Samsung SSD 850 EVO 250GB, WDS100T3X0C-00SJG0
    PSU
    don't remember
    Case
    Corsair Carbide 100r
    Cooling
    stock
    Keyboard
    DAC something or other
    Mouse
    Logitech M-U-0007
    Internet Speed
    80/6 Mbs
    Browser
    FireFox
    Antivirus
    Kaspersky Internet security
I discovered that SMTP was not enabled in the email I account. I requested it be enabled, but it still didn't work. Then I remembered reading that the Thunderbird account definitions using for connections using OAuth2 have to be deleted and reentered when some parts of the definition are changed (such as when enabling OAuth2). I guess it has something to do with setting up the OAuth credentials. Having nothing to lose, I deleted the definition, reentered it, and then the SMTP connection worked!
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11Intel Core i5-840016GBIntel UHD Graphics 630
    OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Microsoft
    CPU
    Intel Core i5-8400
    Motherboard
    ASUS PRIME H370-PLUS
    Memory
    16GB
    Graphics Card(s)
    Intel UHD Graphics 630
    Sound Card
    On board
    Monitor(s) Displays
    Samsung SyncMaster 2043BWX
    Screen Resolution
    1680 x 1050
    Hard Drives
    Samsung SSD 850 256GB
    WDC 1TB NVMe
    WD 3TB external USB drive
    PSU
    I don't remember
    Case
    Corsair something-or-other
    Cooling
    Air CPU + 2 case fans
    Keyboard
    DAS S Pro (Cherry Brown)
    Mouse
    Logitech USB of some sort

  • At a glance

    Windows 10 21H1i5-840016GBon board
    Operating System
    Windows 10 21H1
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homegrown
    CPU
    i5-8400
    Motherboard
    ASUS PRIME H370-PLUS
    Memory
    16GB
    Graphics card(s)
    on board
    Sound Card
    on board
    Monitor(s) Displays
    Samsung SyncMaster 2043 BWX
    Screen Resolution
    1280 x 1024
    Hard Drives
    Samsung SSD 850 EVO 250GB, WDS100T3X0C-00SJG0
    PSU
    don't remember
    Case
    Corsair Carbide 100r
    Cooling
    stock
    Keyboard
    DAC something or other
    Mouse
    Logitech M-U-0007
    Internet Speed
    80/6 Mbs
    Browser
    FireFox
    Antivirus
    Kaspersky Internet security
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