I've been experiencing a similar problem since beginning of September! Some-not 
all- messages are duplicating,in particular,Wamug stuff.I clear my Server of 
messages every day and maintain a low level of messages in my Mail App. OS 
10.6.8 iMac 27" 3.2 Ghz Intel Core i3  Curious!

On 08/09/2011, at 8:50 AM, Ronda Brown wrote:

> 
> On 08/09/2011, at 4:52 AM, Rick Armstrong wrote:
> 
>> 
>> For some reason Mail has triplicates of recent received messages from 1 Sept 
>> to 8 Sept.
>> 1. Mail has now 931 unread triplicate messages.
>> 2. I cannot delete them.
>> 3. I have trashed the ‘Envelope Index’ but Mail crashes when I launch Mail, 
>> (looks like it is trying to import and rebuild about 12,000 messages before 
>> it quits).
>> 4. As nothing has happened I have put the ‘Envelope Index’ back into Mail 
>> (Users>Library>Mail)
>> 5. I have done the "rebuild" and synchronise" account.
>> 6. I have to send this from my iBook because I can't receive or send emails 
>> now.
>> The hard drive is getting full and I have tried to clear some space but 
>> perhaps it is not enough to enable Mail to rebuild.
>> (My quick solution is to go to Officeworks this morning and get an external 
>> to clear a lot more space on the hard drive OR if the group can suggest 
>> somewhere else to get an external quickly, I have to do this anyway because 
>> the drive is getting towards capacity)
>> Thanks, Rick
>> Tiger 10.4.11
> 
> Hi Rick,
> 
> Is this a POP Account and are you leaving Mail on The Server?
> If it is and you are leaving mail on the server, go to Mail > File > 
> Preferences > Select the Account, select the Advanced Tap, check "Remove copy 
> from server after retrieving a message:", and select “Remove Now”.
> That will leave nothing on the mail server if you are comfortable with that. 
> Then, manually delete any additional messages that may be taking up extra 
> space.
> 
> You can then remove as much as possible from your Hard Drive until you have 
> enough Free Space on it.
> Sounds like your Mail might require some clearing out and your Hard Drive.
> 
> 
> Cheers,
> Ronni
> 
> 17" MacBook Pro 2.3GHz Quad-Core i7 “Thunderbolt"
> 2.3GHz / 8GB / 750GB @ 7200rpm HD
> 
> OS X 10.6.8 Snow Leopard 
> OS X 10.7 Lion
> Windows 7 Ultimate (under sufferance)
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