Worst decision I ever made was to switch from Eudora to Thunderbird. There is no going back.
Two things. First I have tried every solution available on the internet there is to stop Thunderbird from deleting emails from the server and nothing has worked.
Second, the search engine on Thunderbird is terrible. In Eudora you have options such as the following: To, From, Subject, Body. Why can't Thunderbird do that. It is really unfortunate that it isn't as easy to transfer everything back to Eudora--basically, I 'm stuck.
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- User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0
What is the account type, POP or IMAP?
I recommend this article that explains the 3 main types of search: Classic, Global and Quick Filter Bar. The QFB is the easiest way to search by Sender, Recipients, Subject or Body.
There is a setting for retaining messages on the server - for POP3 type accounts.
Under the Tools Menu select Account Settings Under the POP3 Account select Server settings Check the Checkboxes for: "Leave Messages on Server" and ... "Until I delete them." Click the OK Button. (See Screenshot 1)
You CAN search for any of those 4 things on TB also! It is called the "Quick Filter" Click the Quick Filter button In the search box that drops down: type your search term THEN, Under the search term box click on buttons to search for that term in The Sender, The Recipients, The Subjects, or the Body of the emails.
According to the screenshot - I have 2 messages with the word platypus somewhere in the BODY of the emails.
If the search term is not found - TB offers to search ALL of the OTHER Folders for that term!
Look at the screenshots, please.