On this new install, it has a newer version of Thunderbird mail.
Does anyone know where to click to tell it to delete emails off the server once they're retrieved - since I have 2 computers it's retrieving emails I already read on one of the computers.

Ubuntu 22 lts user here

Welcome to LinuxQuestions.

There are essentially two methods to access email, imap and pop3. pop3 downloads email to your computer and then deletes it from the server. All email is then stored on the local computer. In your case depending on what computer you read that particular email will only be on that computer which may or may not be convenient.

imap just accesses the email from the server, it does not download or delete and you can then view the same email from multiple devices. Just delete the email once read which moves it to the trash can and then empty the trash to delete it from the server. When the other TB app updates it should be gone. imap is the preferred method and probably is what TB automatically configured when you entered your email information.

Thanks, I'm fairly sure my laptop has a pop3 setup, and in the server settings on it one can check to not leave mail on the server.
I think my new desktop has the imap setup. So what you're saying is that with the imap setup, when one deletes the mail in Thunderbird (and empties trash perhaps) then it is also deleted from the server. Interesting.

Here is a screenshot of the laptops settings. The server settings to "not" leave mail on the server aren't on my Thunderbird on my desktop

Attached Thumbnails

 

Using no connection security settings now days saying this mildly is a bit careless. Does your email server offer any encryption options? I have not used pop in years but that would be a valid option where as it would not be for imap setup.

1 members found this post helpful.

I think this will do it. I'm using v. 102.15.1.

Edit-->Settings-->Account Settings-->[Account]--->Server Settings.

Agree 100% with michaelk on both IMAP and the security settings; POP3 is *TERRIBLY* insecure, and IMAP does give you flexibility between systems, since you just access the mail from the client, versus downloading it as POP does (or can, at least...depending on settings).

Using POP3 these days is like using telnet or FTP...very, VERY insecure. You're sending everything clear-text, so ANYONE with very little skill can pick up anything they'd like. May want to PM this member who also has problems with Thunderbird:
https://www.linuxquestions.org/quest...on-4175729944/

1 members found this post helpful.

And as seems usual these days, I'm on the contrary.

POP3 is handy to me, and I use it for my day-to-day still. For the mindless crap I generally get from the unwashed masses on the 'net security is the least of my worries. Everything else is a link that requires a passphrase or similar to process.
Scaremongering for the ignorant.

Well, I'd not consider myself ignorant but I do have a 'junk' email account for things, as well as a personal and business account. Junk account I don't care if it's compromised. But the other two I use 2FA on, and have security/encryption enabled.

I've had two members of my family have their email compromised and things stolen because of lax security/bad passwords. I don't think it's scaremongering to use appropriate caution, when it takes very little to do so.