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Author Topic: Email: SPF and DMARC  (Read 658 times)

Weaver

  • Kitizen
  • ****
  • Posts: 4004
  • Retd sw dev; A&A; 3 × 7km ADSL2; IPv6; Firebrick
Email: SPF and DMARC
« on: April 01, 2017, 08:01:13 PM »

Email: I have been using SPF in soft-fail mode ("~all”) for a long time. Now I am using DMARC to get reports about SPF 'violations' if that is the correct term. How often do you find that SPF gets screwed up because of stupid servers doing redirects / forwarding and borking the relevant origin information in the process, so that bogus SPF failures are generated?

I think that I read somewhere that one or two big outfits are using SPF seriously. If so, how do they deal with these problems?
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Chrysalis

  • Content Team
  • Kitizen
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  • Posts: 4948
Re: Email: SPF and DMARC
« Reply #1 on: April 01, 2017, 08:35:38 PM »

The main players wont reveal exactly how they score email for good reason, but generally its advised to not block emails solely on the SPF status, so if that advice is followed then the email with issues can still be delivered.
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Sky Fiber Pro - Billion 8800NL bridge & PFSense BOX running PFSense 2.4 - ECI Cab

Weaver

  • Kitizen
  • ****
  • Posts: 4004
  • Retd sw dev; A&A; 3 × 7km ADSL2; IPv6; Firebrick
Re: Email: SPF and DMARC
« Reply #2 on: April 01, 2017, 08:58:39 PM »

Is it even feasible to use "-all" though?
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Chrysalis

  • Content Team
  • Kitizen
  • *
  • Posts: 4948
Re: Email: SPF and DMARC
« Reply #3 on: April 01, 2017, 09:07:39 PM »

of course
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Sky Fiber Pro - Billion 8800NL bridge & PFSense BOX running PFSense 2.4 - ECI Cab
 

anything