Issue:
Spam e-mails are being sent from private domain via spoofing / forging.
Resolution:
Create SPF Record. (This example is for Domains hosted with Simply Mail Solutions)
Method:
Create new TXT record in DynDNS account:
“v=spf1 ip4:88.151.128.0/21 ip4:88.151.129.0/24 ~all”
Allows e-mails to come from IP Address ranges:
88.151.128.0/21 and 88.151.129.0/24.
Then denies everything else.
Links:
Microsoft SPF Wizard
SPF – FAQ and Common Mistakes
SPF Record Testing Tool
SPF Example
