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Updated SPF how to (markdown)

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Dennis Baaten 2019-05-20 13:34:07 +02:00
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SPF-how-to.md
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@ -11,7 +11,12 @@ Our current e-mail infrastructure was originally designed for any mail sending h
to-do to-do
# DNS records (outbound e-mail traffic) # DNS records (outbound e-mail traffic)
SPF for outbound e-mail traffic is limited to setting an SPF record in DNS. This enables other parties to use SPF for validating the authenticity of e-mail servers sending e-mail on behalf of your domain name. SPF for outbound e-mail traffic is limited to publishing an SPF policy as a TXT-record in a domain name's DNS zone. This enables other parties to use SPF for validating the authenticity of e-mail servers sending e-mail on behalf of your domain name.
The example below shows an SPF record with a **hard fail**.
> v=spf1 mx ip4:192.168.1.1/32 ip6:fd12:3456:789a:1::/64 a:mail.example.com a:mail2.example.com -all"
Although a soft fail (~all) is recommended in order to prevent false positives.
# Inbound e-mail traffic # Inbound e-mail traffic
@ -27,5 +32,4 @@ SPF for outbound e-mail traffic is limited to setting an SPF record in DNS. This
* DNSSEC is used * DNSSEC is used
* Mail server is operational * Mail server is operational
## Outbound e-mail traffic