no external relay found, skipping DMARC check

"Gregory Colpart via users" <[email protected]>
Newsgroups gmane.mail.spam.spamassassin.general
Message-ID <[email protected]> 
Hello,

I try to use Mail::SpamAssassin::Plugin::DMARC with SpamAssassin 4.0.0

I installed Perl dependencies.

But I fail to have DMARC check, I have this debug message:

Oct 14 09:47:45.091 [1486800] dbg: DMARC: using Mail::DMARC::PurePerl for DMARC checks
Oct 14 09:47:45.091 [1486800] dbg: DMARC: no external relay found, skipping DMARC check

What is "external relay"?
How to enable DMARC check?

Regards,
-- 
Gregory COLPART
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