Thunderbird Support Forum

Hi,

I am facing an issue with Thunderbird.

I integrated my email address but there problem is the new message is giving "Undelivered Mail Returned to Sender" but I can reply and receive the emails.

Please guide me about it.

Many Thanks

First, I am supporting a family member, who has TB configured on two separate machines. Configuring for Comcast IMAP+SMTP, in the usual manner; nothing esoteric about that, all very routine.

Machine A seems to be working okay, no errors. TB up to date on this machine, connected over an ethernet wire, if that makes any difference.

Machine B, getting spam prompted over IMAP 1014 errors. No other information is provided than 1014.

I have tried dropping the account configuration hundred percent, restarting TB, re-adding the account configuration, to no avail. Still spam 1014 errors.

I did happen to notice TB needed an update, so I did that as well. Still 1014 errors.

I have also tried dropping that email saved password from the saved passwords, and responding to the subsequent re-enter password prompt. Also to no avail.

What if anything might have changed, and how can we contend with this? What is so corrupt, do we need to be mucking around in any AppData files, roaming files, etc?

We are not the only ones, apparently, to have bumped into this issue. Not sure if this is also Comcast specific, since a recent TB and/or IMAP specification change, i.e. maybe we try with a gmail account, for instance.

Wondering also, is it IMAP and/or Comcast somehow tieing Machine A to the IMAP and not releasing that association? Knowing a little bit about IMAP in this regard. And/or somehow now prohibiting Machine B+ from establishing a connection?

One of my two gmail accouns has suddenly become impossible to access (cannot receive, cannot send). T'Bird produces an Authentication has Failed notification, after a Google Window headed "Sign in to Mozilla Thunderbird Email" which refuses to go away. Clicking on the 'help' or 'privacy' options in that google window produces no more than a blank window but then "Sign in to Mozilla Thunderbird Email" reappears a few minutes later. My other gmail account doesn't have this problem, so I assume it's not gmail but it's T'Bird.

What's going on?

(BTW signing into this Support resulted in an email "New sign-in to Mozilla Support" warning "New sign-in to Mozilla Support to Firefox on Windows 10". Trouble is, I'm on Windows 11. Trivial maybe, but telling maybe.)

Hi, 3 weeks ago I suddenly could not log in to my email without errors.

First I get a Google screen "Choose an account" showing the three Gmail accounts I use. I select the first one.

"Mozilla Thunderbird wants to access your Google Account". This refers to calendars. I take the Allow option.

Then I get the message "Warning: Potential Security Risk Ahead

Thunderbird detected a potential security threat and did not continue to localhost. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details."

When I close this window I get another Google screen .

"Mozilla Thunderbird wants to access your Google Account". This refers to i) mail, ii) contacts, and iii) calendars. I take the Allow option.

Then I get the same message message "Warning: Potential Security Risk Ahead

Thunderbird detected a potential security threat and did not continue to localhost. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details."

This process cycles through the other two emails. Then I get and authentication failure message.

I have seen hints that this might be a certificate issue but I have tried in vain to find certificates stored in Thunderbird.

Any help approeciated.

Thanks

PaulM

Thunderbird 115.11.0 (64-bit) Edition Windows 11 Home Version 23H2 Installed on ‎10/‎22/‎2022 OS build 22631.3593 Experience Windows Feature Experience Pack 1000.22700.1003.0

Processor 12th Gen Intel(R) Core(TM) i7-1260P 2.10 GHz Installed RAM 16.0 GB (15.7 GB usable) Device ID 5E92FCAE-C72A-4252-8BD4-D8E95E052268 Product ID 00342-22036-83915-AAOEM System type 64-bit operating system, x64-based processor Pen and touch Touch support with 10 touch points

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I am using Thunderbird 115.10.1. I want to send an encrypted email with attachments of different types (pdf, docs, images, zips,...)

I have set up PGP following this guidance: https://support.mozilla.org/en-US/kb/openpgp-thunderbird-howto-and-faq#thunderbird:linux:tb115

And I have confirmed it is working with Edward following this guidance: https://emailselfdefense.fsf.org/en/

But I have tried looking online to check, are the attachments to the email also encrypted?

I have set up PGP with the following guide: https://support.mozilla.org/en-US/kb/openpgp-thunderbird-howto-and-faq#thunderbird:linux:tb115

Under test set up it says I only have to ensure that the from: email is correct.

But what if I use a different reply-to email address?

for example:

• Person A has a PGP is set up for PrsA@example.com, they also publish their public key in https://keys.openpgp.org/, Their reply-to email is PersonA-lastname@example.com
• Person A sends email with PGP public key attached to Person B. Person A already has Person B's public key.
• Person B receives the public key and saves the cert in relation to PersonA-lastname@example.com just to be sure they go to https://keys.openpgp.org/ to check but it is not there.
• Person B sends an encrypted email to their only known address (personA-lastname@example.com) with the encryption public key provided.
• Would Person A be able to receive the email?

tests I have done:

• I tried this with edward-en@fsf.org and I get an email back saying: Diagnostic-Code: smtp; 550 Edward needs reply-to or from to be the same as envelope from
• I tried this to myself and I am able to read the email.

I have the most recent updated Thunderbird, I wish to delete a email account, however under settings Account Actions is absent. I have tried searching for and answer but no way to remove it so far. I have used Thunderbird for near 10 years and usually there is the Account Actions menu item. I see all settings its should be right under the item Return Receipts. But nothing is there.

Thank You for the help.

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