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String Bass Level 1 Level 1 (0 points)
I installed Snow Leopard yesterday. When I came down this morning I discovered that all of my email boxes had 4 copies of each email in each in box. The mailbox did not have this issue. I put them all off-line when it appeared that copy number 5 was starting to download. The box to delete files on the server had ben reinstated for one of the rogers accounts, which had not been set in Leopard. I have used this computer since late May using Leopard without this problem. Any suggestions? I haven't yet called Apple or Rogers.

iMac 24 inch May 2009, Mac OS X (10.6), Toronro
  • russcus Level 1 Level 1 (0 points)
    I am experiencing a similar issue. Two copies of each message addressed to my company Exchange account. After I open and read one copy, the extra one disappears when I attempt to open it. I have not yet found a work around. I am reluctant to trash my mail prefs file because that action requires that I reenter all my account information for six accounts. Deleting the mail caches and rebuilding them did not remedy the problem.
  • A A P L Level 7 Level 7 (21,730 points)
    I had this problem once during testing, and filed a bug report on it.
    Have not been able to reproduce since.
    Do you also use Entourage?
    I believe mine occurred when I had both running during testing.
  • russcus Level 1 Level 1 (0 points)
    No, not using Entourage.
  • A A P L Level 7 Level 7 (21,730 points)
    That was the one thing I thought might have triggered it.
    So, it's either Mail or the EXCH SERVER.
    Hard to say as I only saw this once.

  • klrogers Level 1 Level 1 (0 points)
    I am getting two copies of every email as well, but it is also going back at a certain point in the day and re-downloading two copies of EVERY email since 8/23. So this morning I wake to fine that instead of the 5 new emails I would have in my box, there are 262. Two copies of every email since 8/23, even the one's I've deleted. VERY frustrating!! I am not on an exchange server, just regular pop3 email accounts.
  • Romulox2000 Level 1 Level 1 (10 points)
    Same here, and this has never happened to me in the 10 years with my service provider. No exchange, just regular POP acct. Only has happened once so far - I left for 10 mins and came back to 233 emails. Just sorted by unread and deleted.
  • 2020hindsight Level 1 Level 1 (5 points)
    I had this once just after installing. I don't use Exchange or Entourage, just Mail. I deleted the duplicates and it hasn't happened since.
  • Resn8tor Level 1 Level 1 (115 points)
    I'm seeing this as well. Duplicates were downloaded and I deleted them. Later they were all downloaded again, so I'm currently at three copies of all emails since installing SL. Straight POP account.

    I did notice that remove from server after downloading was checked and set to one week. I don't recall what the previous setting was, so I've set it to immediate to see if that makes any difference.
  • Barry Karlin Level 2 Level 2 (215 points)
    I also received 2 copies of emails when I trashed the prefs and reentered my iSP info but at least my email prob is fixed.

  • Ernie Stamper Level 8 Level 8 (37,555 points)
    Those having this problem, please use the Finder to open Home/Library/Mail and locate the file named MessageUidsAlreadyDownloaded3. Use Get Info to see when this file was last updated -- should be after the last time new messages were downloaded?

    Quitting Mail and removing this file, and then relaunching Mail will result in a freshening of the file, if it has become corrupted, but will once more download everything still on the server. But hopefully for the last time.

  • Peter Monahan Level 1 Level 1 (45 points)
    For those who are experiencing this problem I have a couple of questions.

    1. Are these POP mail accounts ?
    2. Do you have more than one computer checking the same POP account and leaving copies on the server ?


  • russcus Level 1 Level 1 (0 points)
    In my case, it is an Exchange account and iPhone is accessing it along with the computer.
  • russcus Level 1 Level 1 (0 points)
    I deleted the MessageUidsAlreadyDownloaded3 file as Ernie suggested. It's last-modified date was way back in May 2009. I have to wait for new mail in my Exchange account to see if I am still receiving duplicates. I will edit this message afterward.
  • SKEL_73 Level 2 Level 2 (235 points)
    I am also having this problem - it is driving me crazy! Since upgrading to Leopard, I am having multiple messages appear in mail. I now have 3 copies of every message.....

    My accounts are with custom domain servers, not with Rogers (although Rogers is my ISP it shouldn't have anything to do with retrieved messages from another server)
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