Failing SPF & DKIM for lists.debian.org

Hello Debian Team!

It seems that lists.debian.org has some problems (at least on my side) 
for SPF and DKIM validation, which leads to failing DMARC causing mails 
being inserted into the Junk folder:

	R_DKIM_REJECT(4.00)[debian.org:s=smtpauto.stravinsky];
	DMARC_NA(3.00)[debian.org];
	R_SPF_NA(3.00)[no SPF record];

Please see the attached mail for reference.

Thank you & kind regards,

Marcel Menzel