The utility might, I don’t think the implementation here does. I believe this setup can take any IMAP source and import it into a defined email account; Email Source ==> account@NethServer via Imapsync
but you cannot push emails from account@NethServer ==> user@gmail.com(or some other email provider).
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Could you explain why you needed it, I never heard nor needed this flag for imapsync.
If I remember correctly I had an issue with some messages not synced because of headers used by imapsync that were missing for sent items.
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Never encountered such an issue, but it could be interesting to add this feature! 
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time to close this topic 
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