DMARC problems with some emails from the list

Hello,

I'm having problems with some emails from the list, been classified as 

SPAM in my system because of DMARC failures. I'm not sure but this may be a problem with the list configuration.

I attach the log for the failures in the last week.

-- Angel L. Mateo Martínez Sección de Telemática Área de Tecnologías de la Información y las Comunicaciones Aplicadas (ATICA) http://www.um.es/atica Tfo: 868889150 Fax: 868888337