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How to stop Thunderbird 3.1.7 reloading messages when selected?

Thunderbird 3.1.7 on Windows XP
With Inbox selected, when I click on a message subject in the top right pane (message list),  "Loading Message"  flashes up in the status bar.  For some messages, especially those with attachments, there is a 4 second wait after I click on the message subject, then the "Loading Message" status.  For large attachments there is another wait at that point, presumably while the attachment is downloaded (again) from the server.

Under Junk Settings, I do NOT have "Enable adaptive junk mail..." checked.
Under Server Settings, I do NOT have "Fetch Headers only" checked.

I want Thunderbird to download each message & attachment ONCE.
When I click on the subject in the message list, I expect to see the message text immediately.

In the related question, the writer had this same problem 4 years ago, and it magically went away.
Has anyone figured out that magic?
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MatthewNicoll
Asked:
MatthewNicoll
1 Solution
 
Marc ZCommented:
Matthew, by any chance, do you have Tools->Options->Security - AntivirUs - Allow antivirus to Quarantine Emails
Selected?
If so, try unchecking it.
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CianoxCommented:
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MatthewNicollAuthor Commented:
Thanks for the suggestions, but:

mtz1of4: I do not have Options->Security - AntivirUs - Allow antivirus to Quarantine Emails selected.

Cianox: I do not have a "Synchronization & Storage" option under Junk Settings in my version of Thunderbird.  Instead I have "Disk Space".  In there, there is an option to NOT download messages larger than a specified size.  I do NOT have that option checked, so it should download ALL messages.

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ElrondCTCommented:
Is this a POP3 or an IMAP account? If POP3, TB is NOT downloading attachments again from the server. It is scanning the message to see whether there are attachments, and is also rendering HTML if that's used for the message. If there are embedded HTML links to external images, though, I believe those will be downloaded again.

I can't speak to why you had a similar situation that magically disappeared in the past.
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MatthewNicollAuthor Commented:
ElrondCT:  It is a POP3 account.  Thanks for your explanation.  I should not have assumed that the status message "Loading Message"  meant "Downloading Message" !

Your point about "scanning the message" makes sense because I notice that the message which is particularly slow to "load" has an XML attachment. (The XML also displays at the end of the message.)  A message with a much larger attachment of a different type "loads" much faster.    TB must be puzzling over the XML for 4 seconds!  I have had a number of messages with xml attachments lately, and I had not noticed  that the delay only happened on them.   (A separate TB issue, perhaps.)

(The "magic" I was referring to was described in the "Related Solution" linked to above.)
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MatthewNicollAuthor Commented:
I was able to completely solve the problem by going to the Thunderbird View menu, and unchecking the "Display Attachments Inline" option.  Now when I click on a message with an XML attachment, there is no delay.
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ElrondCTCommented:
Thanks for adding that, in case others are looking at this in the future.
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