鳥哥新增
https://linux.vbird.org/events/email_spf_dkim_dmarc.php
https://wiki.freedomstu.com/books/%E9%96%8B%E6%BA%90%E8%BB%9F%E9%AB%94%E5%AE%89%E8%A3%9D%E6%B5%81%E7%A8%8B/page/mailcow-dkim-spf-and-dmarc
測試驗證
https://mxtoolbox.com/SuperTool.aspx
申請dkim
https://easydmarc.com/tools/dkim-record-generator
申請 dmarc
https://dkimcore.org/tools/
bind9
_dmarc.example.com IN TXT "v=DMARC1; p=none; sp=none, rua=mailto:dmarc-reports@your.mail.server"
9999999.example._domainkey.example.tw. IN TXT (
"v=DKIM1;t=s;p=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
"xxxxxxxxxxxxxxxxxxxxxxxxxxx")
9999999.example._domainkey.example.tw. <—註記 黑體部分不需要加上去拿掉