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Thunderbird: can't send SMTP messages

  • 4 replies
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  • Last reply by p.guttridge

p.guttridge
p.guttridge
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I have installed Thunderbird 91.7.0 on a new W11 Pro PC and have tried to setup access to my UCL email account. This service is outsourced the Microsoft. The IMAP incoming mail works OK. I have copied the SMTP server settings from my old PC (which works fine) but the new one refuses to send messages. I have tried killing the firewall & Windows defender, that makes no difference. I can reach the SMTP server with 'ping'. The only thing I can find that is different between TB on the old PC and the new one is that the old one was 32bit & the new one is 64bit. I've run out of things to try to find out why I can't send messages on the new machine. Other email accounts I have, like gmail, work OK. I'd be grateful for any suggestions. Thanks, Phil.

I have installed Thunderbird 91.7.0 on a new W11 Pro PC and have tried to setup access to my UCL email account. This service is outsourced the Microsoft. The IMAP incoming mail works OK. I have copied the SMTP server settings from my old PC (which works fine) but the new one refuses to send messages. I have tried killing the firewall & Windows defender, that makes no difference. I can reach the SMTP server with 'ping'. The only thing I can find that is different between TB on the old PC and the new one is that the old one was 32bit & the new one is 64bit. I've run out of things to try to find out why I can't send messages on the new machine. Other email accounts I have, like gmail, work OK. I'd be grateful for any suggestions. Thanks, Phil.

All Replies (4)

Matt
Matt
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What are the SMTP setting you are using? I do know that some environments are disabling SMTP on Microsoft servers entirely and the OWL addon is required to actually send mail as you have to use the exchange "native" send process which it proprietary. Hence the addon.

There is also a davmail gateway for the slightly more technical which can use exchange and emulates a mail server installed locally (it is also free). You set up Thunderbird to check mail with the davmail instance, not your mail server. I used it for a while years ago when I had a local exchange server running and it was stable and reliable. http://davmail.sourceforge.net/index.html

Office365 does require a little special authorization with davmail it would appear http://davmail.sourceforge.net/faq.html

p.guttridge
p.guttridge Question owner
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Thanks for the reply Matt. I tried to attach a screenshot of my SMTP settings to my first message but that failed to go. Perhaps that's a clue? I have copied that JPG across my LAN to this old machine so I can attach it here (I hope). It's not a WiFi issue as both machines have an Ethernet cable to the router. I am using the SMTP settings UCL say: Server: smtp.office365.com Port: 587 user name: <my id>@ucl.ac.uk Authentication method: OAuth2 Connection Security: SSL/TLS

These all work on my old W10 PC (that I'm using now) but exactly the same set don't work on the new W11 PC. I'd be grateful for any help. UCL are unlikely to help as they say "Thunderbird should work but is not supported" Thanks, Phil.

Matt
Matt
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You might want to ask UCL is they have disabled SMTP for new devices.

p.guttridge
p.guttridge Question owner
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OK thanks Matt, I'll try that on Monday.

Regards, Phil.