[fetchmail] X-Fetchmail-Warnings

Hello,my question is related about the elimination of the following kind of
X-Warnings embedded into email headers whenever I use fetchmail.

Note that I have several email-accounts and that I am subscribed to several
Mailing-Lists,so the following example is just one among the entire list:

X-Fetchmail-Warning: recipient address 
fetchmail-friends(_at_)lists(_dot_)ccil(_dot_)org didn't
 match any local name

Thanks for reading,Regards

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