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I have just installed Thunderbird, am continually getting "certificate for outlook.office365.com" not trusted. I have added Thunderbird to my Malwarebytes exception list, but the the notice continue to come. I have ensured that OAuth2 is the correct authentication method, but the messages persist.

Is there something else I can do to stop these messages?

Would be very grateful, thank you.

Tim Harrison

Hi All. New to Thunderbird but liking what I see. Am trying to install a new certificate but keep seeing the same error message when I attempt to send an email:

Sending of the message failed. You specified that this message should be digitally signed, but the application either failed to find the signing certificate specified in your Mail & Newsgroup Account Settings, or the certificate has expired.

So here is what we know:

The certificate seems to work (I've sent test emails to a couple of test email accounts) when I use it in Outlook safe mode. Can't get it to work in normal Outlook mode because of add-ins, hence my switch to Thunderbird. They seem to appear fine in the S/MIME section for digital signing and encryption and I can even see the certificate when I go into Manage S/MIME Certificates.

Has anyone come across this before / got any ideas about how to resolve this? Thanks!!

We are testing EDI messaging with a government department however it seems that Thunderbird keeps stripping the attachment before the email reaches the exchange and produces this error.

We sent 3 messages:

1. 2 had this error: PKCS#7 argument error: malformed S/MIME encoded PKCS#7 object 2. 1 had this error: no attachment on their end

PKI Certificate is installed in Thunderbird.

I have suddenly started to receive this message when I open Thunderbird "Certificate for IMAP Gmail does not come from a trusted source". When I click on this message I get the attached screenshot.

I've gone through the forums by I can't understand what it is written. It seems like everything that is written is designed for people who have a good understanding of technology. I don't but I was able to determine that the OAuth is properly set.

I am using 128.14.0esr (64-bit) Thunderbird for Linux Mint mint-001 - 1.0 Updates disabled by system administrator Currently on the esr update channel

hello; I am trying to install a new email account on Thunderbird. System found configurations by it self and showed up a Add a Security Exception box. Whatever I do, nothing works. I checked and unchecked the "Permanently store this exception" box, clicked "Confirm the Security Exception", nothing works, I am stuck there. I tried to setup manually according to Webador (my email and server host) details info, it does not work either. I have been researching for weeks now... as we have multiple email addresses to deal with, Thunderbird is really valuable. Anyone can help us? Merci,

Why do I get this message" You are about to override how Thunderbird identifies this site" smtp.genemaas.net:587 when sending email?

Hello, Since last night, we've been receiving illegible and encrypted emails, as shown in the attached screenshot. Please help us resolve this problem, as we are professionals for whom emails are vital. Thank you in advance. Sincerely, G.BOSSERT ITD

I am receiving a notification that states "The certificate for mail.morrisbb.net is not valid for that server. Someone could be trying to impersonate the server ". As a result I am not receiving any emails through Thunderbird, but I can go to the Morris Broadband website to colllect them. I have used Thunderbird for many years without a problem. I don't understand what that notification means. I don't even know what a certificate is! So, in short, I don't have a clue how to fix this issue. Can someone please give me a clue as I'm clueless. Also, I turned off my antivirus program (Malwarebytes) and that didn't help at all. I appreciate your help!

I've encountered an issue specifically with OpenPGP encrypted emails in the latest version of Thunderbird, 140.0.1.

When I receive an email that is encrypted with OpenPGP, the notification bar that allows me to "Load Remote Content" does not appear. This behavior is exclusive to encrypted emails; the option shows up normally for all other, non-encrypted messages.

As a troubleshooting step, I tried to enable the "Allow remote content in messages" option. However, this setting does not seem to affect the encrypted emails at all, and their remote content remains blocked and hidden.

So, I'd like to know if this is an intentional security policy in Thunderbird, or if it's a bug. Is there any way to solve it?

Hello!

I just observed a new issue with S/MIME. When trying to send an encrypted mail to somebody new, I get an error “End-to-end encryption requires resolving certificate issues with somebody@example.com”.

The message is not very helpful, and doesn’t propose any solution. So a web search gave me this article: Prerequisite for sending an encrypted email message. It states:

> If Thunderbird considers the email's signature and the sender's certificate valid, it will automatically be imported and available when you attempt to encrypt an email to that correspondent using the S/MIME technology.

When I open the sender’s mail, the signature is confirmed as valid by Thunderbird.

Ignoring the warning message and trying to send the encrypted mail results in the following error in the log: `mailnews.send: NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIMsgComposeSecure.beginCryptoEncapsulation]`

So, I verified in my list of certificates for people, and that new person didn’t figure in the list. Other people did, the last one from 6 June.

Is it possible there’s a bug causing TB to not import the certificate when I open the mail? What would a workaround be? Is there a way to import a sender’s certificate manually from their signed mail?

Peer Certification expiration - Why is this Pop-up showing up after many years of thunderbird use and why does it prevent receiving and sending emails. It wants a certificate or an exception with out adequate explanation or guidance.

I did not have account set up and because I couldn.t receive email confirmation could not seek help. I contacted Norton who appeared on the company example and they could not resolve. Given I could not get access thunderbird for assistance, I did an uninstall and reinstall. I lost my addresses but at least I was able to sent and receive emails again. the Pop up had gone away.

I set up my second email and when I completed this set up I was greeted by this pop-up. What is this all about and what are the risks. How is it resolved?