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Can't send mails from an Exchange account after upgrading to v38.0.1

Fabio Esquivel
Fabio Esquivel
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I've configured an Exchange account in Thunderbird and used it for years (since v3 to v31.7.0).

I just upgraded to v38.0.1 and although I can receive/download new mails, I can't send out new mails: Thunderbird keeps asking me for the account password (which is saved and protected with the Password Manager) although I enter it each time, correctly, Thunderbird seems unable to authenticate to the SMTP server.

I'm using port 465 on the SMTP Exchange server, with NTLM as authentication method and STARTTLS for connection security; those are the settings the SMTP server has been using for years with no recent change at all.

I just downgraded to v31.7.0 and reinstalled my Lightning v3.3.3 add-on as well: With no changes I can send mails out again, so it's clearly an authentication issue in v38.0.1.

I've configured an Exchange account in Thunderbird and used it for years (since v3 to v31.7.0). I just upgraded to v38.0.1 and although I can receive/download new mails, I can't send out new mails: Thunderbird keeps asking me for the account password (which is saved and protected with the Password Manager) although I enter it each time, correctly, Thunderbird seems unable to authenticate to the SMTP server. I'm using port 465 on the SMTP Exchange server, with NTLM as authentication method and STARTTLS for connection security; those are the settings the SMTP server has been using for years with no recent change at all. I just downgraded to v31.7.0 and reinstalled my Lightning v3.3.3 add-on as well: With no changes I can send mails out again, so it's clearly an authentication issue in v38.0.1.

الحل المُختار

see https://bugzilla.mozilla.org/show_bug.cgi?id=1174159

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All Replies (3)

christ1
christ1
  • Top 10 Contributor
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I went through the same drill.

TB 38 disables NTLMv1. But your Exchange server seems to insist on it. You can set the pref network.auth.force-generic-ntlm-v1 to true (under Options | Advanced | General | Config Editor) to allow NTLMv1 again.

Wayne Mery
Wayne Mery
  • Moderator
  • Top 10 Contributor
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الحل المُختار

see https://bugzilla.mozilla.org/show_bug.cgi?id=1174159

Fabio Esquivel
Fabio Esquivel صاحب السؤال
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I had to set two options to True for it to work: - network.auth.force-generic-ntlm - network.auth.force-generic-ntlm-v1

Modified by Fabio Esquivel