basically you can not do it. You could use a filter to classify mail with that domain in the from as not junk and ensure it goes into the inbox, but that is really about it. The only white list is the address book and as you are no doubt aware an address in there needs a valid email address.

You could create a message filter that moves messages coming from that domain to another folder before the junk filter gets to see them, but even that would only work if it's Thunderbird's junk filter, not the server spam filter that marks them as junk/spam…

Every other email client has this option. I don't know why TB doesn't.

If email auto appears in the Spam folder and you are using an imap mail account:

How to tell if Thunderbird or server is putting email in Spam folder: In imap Spam folder, enable the 'Spam' column header. It will show a flame icon for each email in Spam folder. If flame icon is grey then server put there. If flame icon is red/orange colour then Thunderbird put it there.

If you use an imap account and server spam filter puts it in the server Spam folder then Thunderbird has no control over what is set up server. But usually you can access webmail account via a browser and set it up to allow that particular email address as not spam/good sender then it should be in the Inbox when imap account synches with server.

If email is in Inbox upon download but gets moved to Spam folder by Thunderbird do the following. Set up 1 and 2. Note 3 is optional.

1. Either use 'Personal Address Book' or create a new address book specifically for non personal contacts; you could call it 'Business'. Add that contact and it's full email address into prefered address book.

2. Then set up to use the Thunderbird junk filter which you then train what is and what is not junk.

• Account Settings > Junk settings for the mail account.
• Select 'Enable adaptive junk mail controls for this account'
• Select any address book which you want to act as a whitelist. So make sure to select whatever address book now has that contact.

• Do not select 'Trust junk mail headers set by...'

Destination & Retention

• Select 'Move new junk messages to
• Select 'Other' and choose the Spam folder on imap account.

From now onwards anything you select as Junk/Spam will go to the server Spam folder. Anything you state is 'Not Junk' or 'Junk' will start to train the Thunderbird junk filter, so it learns what you choose. It should also learn to not apply Junk/Spam on anything in a 'whitelist' address book

3. Additional Option to apply Message Filters if you want to auto move incoming email into a specific folder to save you time: Assuming email is not put into Spam folder by server, so it is a new mail being downloaded into Inbox.

• 'Tools' > 'Message Filters'
• Click on 'New'
• Give a suitable name
• 'Filter before junk classification'
• 'Match any of the following'
• 'From' 'contains' 'email address' or part of eg: 'concentix.com'
• to add more lines click on the +

Perform action such as

• 'Move message to' and choose folder where to store it.

• Save and then enable the filter.

All filters operate in the order listed. Suggest you click on 'Filter Log' and make sure it is also enabled.

I have been trying to figure if it's just Thunderbird being stubborn about learning what is "not-junk", or if somewhere in the code they are intentionally tagging these as junk. Anything I get from "Lunduke Journal" is constantly marked as junk, even though I've tried training TB, and even created a filter to flag *anything* from rumble.com as not-junk.

Knowing the Mozilla Foundation's attitude towards Lunduke and much of Rumble in general, I wouldn't be surprised to find some hidden filter to junk anything from rumble.com.

I have been trying to figure if it's just Thunderbird being stubborn about learning what is "not-junk", or if somewhere in the code they are intentionally tagging these as junk. Anything I get from "Lunduke Journal" is constantly marked as junk, even though I've tried training TB, and even created a filter to flag *anything* from rumble.com as not-junk.

1. Is the mail account a Pop or IMAP mail account?
2. Do those 'Lunduke' emails in Junk/spam have a red or grey spam icon ?
3. Have you added the email addresses for 'Lunduke' as contacts into eg: Personal Addresses address book ?
4. Post an image of the account's 'Junk Settings'.

Knowing the Mozilla Foundation's attitude towards Lunduke and much of Rumble in general, I wouldn't be surprised to find some hidden filter to junk anything from rumble.com.

Lunduke says they have no discourse with Mozilla, so basically it looks like one journalistic person is a bit miffed about being ignored and not knowing all the facts. I'm not influenced by personlised rants and don't waste my time reading them.

However, it's irrelevant and off-topic as this forum is all about Thunderbird and junk controls. The built in filter is created by your preferences and in some cases the server determined spam status contents in the email itself. Others will be in Junk/Spam folder because the server filters put them in Spam. So it could be a combination of factors and you would need to offer information in order to see if there is a cause.