Duplicate Emails

Hi,

I have been running a test using fetchmail (6.3.26) on an openSUSE Leap 
15.2 server to retrieve email from a local email account. That account 
has been sent 5 seperate emails. Three of the emails are to single 
addresses, one is to two addresses and another is to three addresses. As 
expected there are 8 separate emails in the local mail spool file from 
the 5 I sent. As a test I am using the fetchmailrc file:

     set postmaster root
     poll cumulus protocol POP3 local mydomain.net envelope "X-Original-To:"
             username "user" password "pass" to * here fetchall keep
             mda "echo 'Hello World - %T - %F'"

The mda is just a dummy to see what is going on when I run it from the 
command line.

It retrieves all 8 emails correctly identifying the origonal recipient 
and %T is substituted correctly for the different email adresses.
Doing "fetchmail -V -f fetchmailrc" confirms that it is running in 
multidrop mode.

If I substitute 'myname' for the '*' (asterisk) in fetchmailrc, 
fetchmail goes into singledrop mode as you would expect (checked with 
the -V option) but also retrieves all 8 emails.

I am not sure which way round it should be, multidrop or singledrop, but 
I do want to remove duplicates and so want to retrieve just 5 emails 
from the spool file (have been reading "THE USE AND ABUSE OF MULTIDROP 
MAILBOXES" on the man page). I have checked that the message-IDs are the 
same and there are multiple recipients on the 'To:' header of the 
relevant emails. I also have a copy of the spool file if it would help.

Any advice or insight would be most welcome.

Thanks

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