Staff from mailbox provider GMX/WEB.DE/mail.com (1&1 Mail & Media GmbH) have just announced on the Mailop list that they'll begin enforcement of DMARC checks in a phased rollout over the coming weeks. What does this mean? It means that if you publish a DMARC policy of p=reject for your email domain, they will now reject email from that domain, during the SMTP transaction, if th…

