dmarcian Tools

Are your Google Calendar Invite Responses Blocked by DMARC?

We have previously discussed the issue of Google Calendar invites (and other Google Suite services) being broken from the perspective of a G Suite owner. But there is also an issue for receivers who interact with Google's email body invite links, as Google spoofs the invitee's domain to generate a notification. If the invitee’s domain is at p=reject, this can occasionally send back a bounce to the invitee, making it confusing for everyone.You may see Google as a source in…
Vaughn Talbert
25 June 2019
Industry News

The Importance of Sources in DMARC

A “source” is what we call any company that offers its clients the ability to send emails with their own domain. This translates to any infrastructure that’s capable of “sending emails on behalf of others.” Bearing this explanation in mind, we can identify several types of sources, the most notable are: ESPs - offer their clients the ability to send bulk (marketing and/or transactional) emails with their own domain ISPs - offer the ability to receive and send emails with…
Vaughn Talbert
23 May 2019

Understanding Shadow IT

For those who’ve been doing IT long enough to remember using a green display monitor also remember a time when everything was locked down and centralized. During the early 1980s, Local Area Networks became more popular and with them came decentralization, allowing other internal departments within an organization to take control of their IT requirements directly, and Shadow IT was born! “Shadow IT” is the use of IT-related hardware or software products within an organization without the knowledge of the…
Vaughn Talbert
23 May 2019

Why SPF is so funky in today’s modern world

SPF (Sender Policy Framework) has been around for a long time and enjoys a rich history reaching back to 1997, with the SPF Project itself starting in June 2003. (a timeline history of SPF can be found here). However, there are some challenges with SPF's feedback and it is often misunderstood. We take a look at these issues, and at the barriers that are keeping SPF from being better A notable issue with SPF is that the people deploying it have to…
Vaughn Talbert
21 March 2019

The History of SPF

Dec 14, 1997 Jim Miller sends Paul Vixie an email with his idea on verifying SMTP MAIL FROM address from means of outbound-smtp MX dns records. Note: This event and the date are not confirmed by public records and are based solely on information provided by Paul Vixie. Mar 27, 2000 – Public mention of the idea to create 'MS' (mail sender) DNS records Bill Cole mentions on usenet newsgroup dedicated to discussions of spam an idea to create 'MS' (Mail Sender) DNS records to…
Vaughn Talbert
18 March 2019

Our SPF Survey tool can show you how much traffic is coming from your listed entries.

To get to the tool, log in and navigate to the Domain Overview. Click on the SPF cell for a domain that has volume, and then click ‘Record Details’.  In the resulting view, select ‘View TMI’.  The reloaded view of the SPF record details integrates DMARC data to show you which of your SPF record entries are in active use for your domain(s), and in what way.  This can help you figure out which old entries in your record might…
Vaughn Talbert
14 February 2019