Hello again, I was able to workaround the getmail issue producing dublettes using Sieve-Filter to find and discard dublettes. I was using this Rule-Set (I found somewhere else in Internet). I only have sometimes dublettes now, but not as worse as before (every mail twice!).
> # Track duplicate Mail-Deliveries
> require ["duplicate", "imap4flags"];
> if duplicate :header "message-id" {
> discard;
> stop;
> }
>
> keep;
Best regards
Gabriel Kaufmann
