{"action":"opened","issue":{"url":"https://api.github.com/repos/cyclestreets/cyclescape/issues/553","repository_url":"https://api.github.com/repos/cyclestreets/cyclescape","labels_url":"https://api.github.com/repos/cyclestreets/cyclescape/issues/553/labels{/name}","comments_url":"https://api.github.com/repos/cyclestreets/cyclescape/issues/553/comments","events_url":"https://api.github.com/repos/cyclestreets/cyclescape/issues/553/events","html_url":"https://github.com/cyclestreets/cyclescape/issues/553","id":146402720,"number":553,"title":"Rejected mail intended for Gmail recipient","user":{"login":"mvl22","id":361423,"avatar_url":"https://avatars.githubusercontent.com/u/361423?v=3","gravatar_id":"","url":"https://api.github.com/users/mvl22","html_url":"https://github.com/mvl22","followers_url":"https://api.github.com/users/mvl22/followers","following_url":"https://api.github.com/users/mvl22/following{/other_user}","gists_url":"https://api.github.com/users/mvl22/gists{/gist_id}","starred_url":"https://api.github.com/users/mvl22/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mvl22/subscriptions","organizations_url":"https://api.github.com/users/mvl22/orgs","repos_url":"https://api.github.com/users/mvl22/repos","events_url":"https://api.github.com/users/mvl22/events{/privacy}","received_events_url":"https://api.github.com/users/mvl22/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-04-06T18:55:41Z","updated_at":"2016-04-06T18:55:41Z","closed_at":null,"body":"We've had one (only) bounce as follows:\r\n\r\n```\r\nThis is the mail system at host navi.vm.bytemark.co.uk.\r\n\r\nI'm sorry to have to inform you that your message could not\r\nbe delivered to one or more recipients. It's attached below.\r\n\r\nFor further assistance, please send mail to postmaster.\r\n\r\nIf you do so, please include this problem report. You can\r\ndelete your own text from the attached returned message.\r\n\r\n                   The mail system\r\n\r\n<USER@gmail.com> (expanded from <USER@THEIR-DOMAIN>):\r\n    host gmail-smtp-in.l.google.com[2a00:1450:400c:c07::1a] said: 550-5.7.1\r\n    [2001:41c8:1:5649::71] Our system has detected that this message does\r\n    550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and\r\n    550-5.7.1 authentication. Please review 550-5.7.1\r\n    https://support.google.com/mail/?p=ipv6_authentication_error for more 550\r\n    5.7.1 information. y4si17310019wme.87 - gsmtp (in reply to end of DATA\r\n    command)\r\n```\r\n\r\nI have substituted the real details for USER and USER@THEIR-DOMAIN. The domain is not gmail."}}