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Questions tagged [dmarc]

DMARC, (Domain-based Message Authentication, Reporting & Conformance), is a technical specification standardizing how email receivers perform email authentication using the well-known SPF and DKIM mechanisms.

DMARC, (Domain-based Message Authentication, Reporting & Conformance), is a technical specification standardizing how email receivers perform email authentication using the well-known SPF and DKIM mechanisms.

http://www.dmarc.org/

152 questions
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DMARC aggregate report: alignment check PASS on mismatched domain

I'm confused by a DMARC aggregate report I received recently and I couldn't find anything similar online. The report says DKIM, SPF passed and they're aligned with the domain in the From: header. But that's not what I see in the report.…
Max Ivanov
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I try to sent emails from different domain names using one email account and get dmarc=fail

For example, I have: example.com (in this domain I create account) need.com (additional domain) I want to give the users the ability to send emails as @need.com using alias in accounts settings. The problem is that all messages go to spam with DMARC…
Vasyl Kolomiets
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spf feedback shows fails for no apparent reason

I do not understand the fail results in the following spf report. Why is it that in the section there are fail tags and in the following everything passes? Here is our spf record: "v=spf1 mx a include:amazonses.com…
Fabianus
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DKIM: fail (body hash did not verify) but DMARC: pass

I received an email (using Office365) which had the following: spf=pass dkim=fail (body hash did not verify) dmarc=pass action=none compauth=pass reason=100 Should DMARC not fail when DKIM fails or? Part of mail header…
PSXYU
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Yahoo Rejecting Mail from Amazon SES with SPF fail error, but also shows SPF pass in DMARC report

Here's a key segment of the DMARC report from Yahoo, who rejects SOME of our messages [replaced some identifying info with text in brackets]: Yahoo! Inc. …
GraniteStateColin
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If my domain is using gsuite and I am using gmail's DKIM, will that DKIM setting be used by another sender on my spf? ie. Klaviyo?

If I have a domain example.com that is using gsuite (DNS settings at registrar has gmail cnames, spf & txt records etc) and I have another service sending on behalf of the domain (Klaviyo). Do the gmail DKIM and DMARC settings help to strengthen the…
B.Sabz
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DKIM and DMARC problems with Route53

DKIM Problem: Here is how I enter the value for DKIM key: "v=DKIM1; h=sha256; k=rsa;…
Chaplin
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How long does a DMARC record take to be recognized?

I created a DMARC record for a domain about 20 hours ago but it is not yet recognized. How long does a DMARC record take to be recognized?
gof
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Sending mail from Gmail via another SMTP server issues

I have an email address forwarding to a gmail account. I then use SMTP to send a response from gmail via the domains SMTP server. This is all set up fine. However some recipients are not receiving the emails? Is there further configuration I need to…
j00m
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Gmail rejects emails, although PTR and SPF are set

when sending email from my Ubuntu 18.04 server to Gmail, I am getting such bounce messages: ... while talking to gmail-smtp-in.l.google.com.: >>> DATA <<< 550-5.7.1 This message does not have authentication information or fails to pass <<< 550-5.7.1…
Georg Jähnig
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Gmail delay receiving email from our domain

I am getting this message when sending Email to Gmail. this message does not have authentication information or fails to pass 421-4.7.0 authentication checks. To best protect our users from spam, the 421-4.7.0 message has been blocked. I have…
Jacob
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DMARC Report Analysis

We are not able to understand the DMARC reports. Below is the one we got from Yahoo. DMARC Report Yahoo! Inc. postmaster@dmarc.yahoo.com …
pooja
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How to prevent RFC5322.From header spoofing

I have an email service in domain example.com. How can I protect it from spoofing USER email addresses in From header? Scenario: Attacker sends email from malory@example.com - connect to my SMTP service, authenticate correctly as malory and sends…
puceduw
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Domain without SPF DKIM and DMARC

I am looking for domains that don't have SPF DKIM and DMARC records. The biggest issue is I can't verify that if a domain is using DKIM, does anybody konw any domain which doesn't have those 3 authentication records?
Hang Hu
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C# - How do you find the DMARC and DOMAIN KEYS (DKIM) mail records of a domain using C#?

I'm building a C# Console application in VS that asks a user to enter a domain e.g. example.net and returns all the mail records (A, MX, SPF, DMARC, DKIM, CNAME) I have used the example below which will return a string of the SPF TXT records, but…
kingcobra
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