This is not really a Yahoo extension problem. The extension does not make the decision on what to download Thunderbird itself does that (following that very strict POP3 protocol).
Every time the Yahoo extension connects to the server it gives to Thunderbird a list of the message identifiers on Yahoo. Thunderbird compares that list with the list of messages it knows it has downloaded before (the popstate.dat file for your Yahoo account). It decides which ones it has not seen before and tells the Yahoo extension to download them. It then updates the list for next time round. If you keep messages on the server Yahoo has a nasty habit of periodically changing part of the message identifier for all the messages held on the server. So, the next time the extension presents the list of the message identifiers to Thunderbird none of them match the list of previously downloaded messages and they all get downloaded again. Long ago the Webmail Author made a change to Yahoo extension to snip out the part of the message identifiers that Yahoo changes. Unfortunately it was not made a default (for good reasons at the time). If you select this option "Use short id" in the Advanced tab for your Yahoo account in the Yahoo extension it will prevent the change made periodically by Yahoo from causing a re-download. Unfortunately there is one problem with setting this option. It will cause a re-download of all of your messages one time. After that you will not get further re-downloads. There is Thunderbird add-on (Remove Duplicate Messages) that can be used to delete duplicate messages in your Inbox. On Dec 7, 11:48 am, Webmail Author <[email protected]> wrote: > Try compacting the folder an index may have been corrupted -- You received this message because you are subscribed to the Google Groups "Thunderbird Webmail Extension" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/thunderbird-webmail-extension?hl=en.
