Missing DMARC on weblate.org

##Summary Email spoofing is possible due to missing SPF/Dmarc Records. Similar to this report submitted to Hackerone itself: https://hackerone.com/reports/575 ##Steps to reproduce: 1- Go to https://emkei.cz ( A Fake Mailer ) 2- Set the from to parameter as [email protected] or any other name, and send it. 3- The email is sent with any content you'd like to add as the message. Thanks.