Can I assume a SMTP sender has a SPF record

Daniel Nashed  11 May 2021 08:05:50

Just checked all my mails my SpamGeek received this year for DNS-TXT records.
I added all DNS TXT records to existing SpamGeek logs.

Now I am looking into the results..

I am not yet automatically checking SPF records -- this is the step before to check if I want SPF records ...

• Almost all my customers have SPF records
  
• Many spammer or newsletter sender have SPF records
  

So what would be the strategy?

• I would give someone without SPF record a small negative reputation?
  
• Give anyone with not matching SPF higher negative reputation?
  
• Do nothing for someone with a good SPF record? --> Because that is what I would expect?
  

Not sure you can modify the behavior of your anti-spam in that detail?
But if you could, what would be your strategy?

The next step is really to add libspf to the Linux version of SpamGeek.
The code is ready to go. I just need to plug it in --> https://www.libspf2.org/


-- Daniel

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