I've tried to correct within Options|Security|Junk - > Reset Training Data

This may not have been a clever move. Wrt junk mail detection you're now starting from scratch as far as Thunderbird is concerned. So you'll have to train the filter again. That means manually marking junk messages 'As Junk' and manually marking good messages as 'Not Junk'.

In order to explicitly block a sender you'd need to create a filter, which I doubt you did.

Beyond that spam filtering typically also happens on the server. Login to your account via webmail and check the settings on the server, as well as the spam folder on the server. The behavior you see can be different depending on your account type.

What is your account type - POP or IMAP?

Thanks! I have gone to my web mail portal.. that's actually how I discovered that Thunderbird was blocking those people. (Who happen to be in our company's compliance and supervision dept.) Her address was not on any block list in fact, the web based list is empty as well as the Anti-virus block list. And, for better or worse Thunderbird's list was eliminated when I reset the training data.

However, I'm still not getting either of their emails... still. I am receiving other email with in their domain, but I've also checked to see if there was something blocking the domain and still nothing.

Still need HELP!

Thanks!

I'm not getting all my emails...

How exactly do you determine that?

I have gone to my web mail portal.. that's actually how I discovered that Thunderbird was blocking those people.

What does this mean? More details, please.

I need to remove email from the Junk or Blocked List

Junk mail filtering is typically done using a learning algorithm, not static block lists.
As explained before, for Thunderbird junk mail filtering the algorithm needs to be trained to work properly.

If this is a corporate email account, you should talk to your IT folks.

The junk filtering (learning) usually contains a database of learned good/bad. As you stated above "Thunderbird junk mail filtering the algorithm needs to be trained to work properly" anyone with two minutes of IT experience understands that. What's needed, is access to the "Allow/Block" database for that email account. And as for the algorithm itself... well nothing is perfect. The fact is I know of at least two emails that no longer come into my local Thunderbird application. And while the web access portal has been available all along, which until recently I never looked at due to having set the account up in Thunderbird, the idea seeing it online in the web portal and those same emails never reaching my local TB app is why I'm on this mission. I never liked or wanted to be forced into using MSOutlook locally or online... without a fix to this issue though I may have to do just that... That would be very sad.

What's needed, is access to the "Allow/Block" database for that email account.

There is no such "Allow/Block" database. You're welcome to make yourself familiar with how the algorithm works. Google is your friend.

... the idea seeing it online in the web portal and those same emails never reaching my local TB app is why I'm on this mission.

It would certainly help if you can answer all the questions being asked so far, starting with what's your account type.
It's quite possible the the filtering happens on the server and thus the message will never get to Thunderbird. But that depends on your actual setup.

Here is some Info It's a POP mail server east.exch092.serverdata .n_t Port 995 SSL/TLS Normal Password Check for messages on startup check every 10min Auto download new messages

Please let me know what other information is needed

It's a POP mail server

With POP for an email client only Inbox is visible on the server. This is not specific to Thunderbird, it's how POP works.
Now when junk filtering happens on the server, messages are moved to the Spam/Junk folder on the server, and Thunderbird will never see those messages.
Only messages which are downloaded are applicable to Thunderbird's own junk mail controls.

So with that setup, you'll have to login to your account via webmail, and check your Spam/Junk folder on the server on a regular basis.

Thanks! Yes, I agree, logging onto the Web Server is how I found the problem existed in the first place. I just happened to be on the actual web server portal and saw messages there that never showed in my local TB app. I looked for a common theme about the ones not showing up locally. The emails that were missing were specific to our group, and my partner get them without any issues. Oh, and none of those emails were in the web server in junk or spam. Just sitting in the INBOX like I'd expect them to be on my local TB app.

Also, I've now also searched the Registry for those addresses as well... but to no avail

I know it seems crazy, but having worked with TB and NSMail before that.... I kind of know what to look for, but never before has done anything this cra cra. Completely missing email locally but easily seen in the INBOX on the web portal. Still not sure if I need to crash the local account and start from scratch in TB again??? Please provide and input or resource available... ASAP Please. My compliance Dept is getting on my nerves about this issue. [phone number] Thanks!!

OK The final resolution to this issue...

Copied everything to folders that needed to be saved. Deleted the email account. Restarted Recreated the email account as new...

All missing email that was previously blocked/junk is now showing up. Yes, I will have to re-train the junk filter, that's a give-in. However, to be able to keep TB vs being forced into MSO is great!