Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird 102.0.1 (64-bit) Mac - Digital Signing - Send Message Error

  • 1 reply
  • 1 has this problem
  • 135 views
  • Last reply by Bubba
  • Solved

I have three accounts with sign/encrypt certificates. Prior to the update just now, they worked fine, and have for several years. Now after the update, when I try to send an email I get an error message: Sending of the message failed. Unable to sign message. Please check that the certificates specified in Mail & Newsgroups Account Settings for this mail account are valid and trusted for mail.

I get these messages in all three accounts with certificates. I checked the settings, and the certificates are correct.

Any ideas?

Thanks.

I have three accounts with sign/encrypt certificates. Prior to the update just now, they worked fine, and have for several years. Now after the update, when I try to send an email I get an error message: Sending of the message failed. Unable to sign message. Please check that the certificates specified in Mail & Newsgroups Account Settings for this mail account are valid and trusted for mail. I get these messages in all three accounts with certificates. I checked the settings, and the certificates are correct. Any ideas? Thanks.

Chosen solution

Fixed. For some unknown reason 102 was missing an intermediate certificate.

Read this answer in context 👍 0

All Replies (1)

Chosen Solution

Fixed. For some unknown reason 102 was missing an intermediate certificate.