feat: Add "Mail DNS Setup" page

content/posts/mail-dns-setup.md

@@ -0,0 +1,29 @@
+---
+title: "Mail DNS Setup"
+date: 2020-12-19T15:59:43+01:00
+draft: false
+---
+
+Since I always struggle with DNS records for mailservers... here are some examples:
+
+## DMARC
+
+```
+_dmarc TXT "v=DMARC1; p=none; rua=mailto:dmarc@domain.tld"
+```
+
+- **v** - version of DMARC (`DMARC1`)
+- **p** - policy (`none`, `quarantine`, `reject`)
+- **rua** - URI for agreggate reports (comma-separated)
+- **ruf** - URI for failure reports (comma-separated)
+
+## SPF
+
+```
+@ TXT "v=spf1 mx -all"
+```
+
+- **v** - version (`spf1`)
+- **mx** - allow emails from servers specified in MX records
+- **-all** - don't allow from everyone else
+