MailServer

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Postfix Tutorials

SPF DNS Entry

Traxel Settings

  • IPV4: 69.10.40.10
  • IPV6: fe80::d227:88ff:fe34:7999/64
  • Format: v=spf1 ip4:40.113.200.201 ip6:2001:db8:85a3:8d3:1319:8a2e:370:7348 include:thirdpartydomain.com ~all
  • Start with the SPF version, v=spf1.
    • Indicates that this is an SPF record.
    • Will always be spf1 as other SPF versions have been discontinued.
      • We'll only ever need 640K of RAM.
  • Next, all IP addresses that are eligible to send email on behalf of your domain.
    • Space delimited
    • prefix ip[n]:
    • ip4:69.10.40.10 ip6:fe80::d227:88ff:fe34:7999
  • Next comes the include statement, which lists every third party organization that sends email on your behalf.
    • Does this mean interserver? Is this the part where reverse lookups come in?
    • include:thirdpartydomain.com
  • The end of the SPF record is the strictness level.
    • "-all" - strictest, fail email that doesn't come from this ip list
    • "~all" - accept but flag email from other servers
    • "+all" - anything goes
    • I'll be using "-all".

Looks like the only remaining question is the "include" tag. How do I handle the include tag and/or flag my server from the reverse lookup standpoint?