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Questions tagged [dmarc]

Domain-based Message Authentication, Reporting, and Conformance (DMARC) is a mechanism by which the owner of a domain uses specially formed DNS records to express domain-level policies and preferences for email validation, disposition, and reporting.

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Further understanding of SPF, DKIM, and DMARC

I've been trying to wrap my head around some of the information I've gathered online, and I was hoping for some clarification. We are using Office 365, for our email server. A.) Are SPF records and DKIM actually doing anything on their own, if DMARC…
level42
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Emails fail DMARC check despite having the sender IP in SPF

I have the following DMARC record set up: v=DMARC1; p=none; rua=mailto:rua@mydomain.com; ruf=mailto:ruf@mydomain.com; sp=none; fo=0:1:d:s I have the following SPF record set up: v=spf1 mx -all the MX record has 3 IP addresses. One of those IP…
SaidAlbahri
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dmarc. Why do I receive failed SPF or DKIM authentication reports for forwarders?

I set _dmarc to see my email authentication reports (in case it fails). like that "v=DMARC1;p=quarantine;pct=100;rua=mailto:dmarcreports@example.com" And I receive these reports form Google. a report I receive my emails are good, because they are…
Yevgeniy Afanasyev
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Mail issues only with Google App domains

I have a local mail server set up. It is connected via a dedicated IP (with an appropriate PTR record). I have DKIM, DMARC, and SPF set up. My domain has been added to Google's Postmaster Tools and is verified. If I use mxtoolbox to verify my…
Joseph
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DMARC permission to receive all reports on an external subdomain

I'd like to set up a DMARC record so that I can receive reports on an external subdomain. To be specific, I have a domain called send.com which sends emails and is monitored by DMARC. The aggregate reports generated by DMARC are sent to an email…
lgc_ustc
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Mail tester have 10 score, but email flagged as spam, by gmail

I have setup an smtp postfix server, with opendkim, on a domain code-gmail.com I have put spf policy, dkim, dmarc in my domain TXT recors. I did setup reverse dns, to point correctly do my domain, i filled in mx servers ( mail.code-gmail.com ), even…
ThinCrustItalianPizza
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No protection for gmail spoofing?

Somebody can verify that gmail's SPF and DMARC records are: "v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ~all" "v=DMARC1; p=none; sp=quarantine; rua=mailto:mailauth-reports@google.com" So no…
gip
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Business email alias hijacked

One of the clients I work for has a test@xxxx.com account. I believe it's an alias, and I got an email signing up for a random site (it's a legit site) presumably to test that someone had access to it. It had a confirmation link in it, and the same…
Jono
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Bounced Incoming E-Mail in Gmail because of failed DMARC verification

gmail-smtp-in.l.google.com[2a00:1450:400c:c09::1a] said: 550-5.7.1 Unauthenticated email from example.com is not accepted due to 550-5.7.1 domain's DMARC policy. Please contact the administrator of 550-5.7.1 example.com domain if this was a…
br0ken.pipe
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After adding authentication to mail server, can't connect for SMTP

Up to yesterday, my mail server (at mail.simunomics.com) was functioning properly with regards to my mail clients - sending and receiving. However, it was not authenticating properly with recipient servers because it hadn't been configured yet.…
Infinitive
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Why my DMARC are not giving permission for reports?

In all servers I have a DMARC record for sernd email in ahother domain in my WHM , but when test with mxtoolbox show this error : 'DMARC are not giving permission for your reports' this is the stucture of my recors: Note. The server is a CENTOS 6…
Jorge Omar
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DMARC un-aligned, by business necessity?

I'm new to DMARC so this may be a silly question (sorry if it is): Base facts: My company has a primary name and many other "doing business as" (DBA from here on) partnerships. However each of these various domains are simply aliases for the…
NorthVandea
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DMARC report. A server sending mail/impersonating my domain?

I've recently set up DMARC, SPF and DKIM. I'm now checking all DMARC reports I'm receiving. I've noticed the below entry which looks like an IP which is outside my control (the other IPs mentioned I see daily and are the ISP SMTP). So this one entry…
th3penguinwhisperer
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DNS record check requested (spf, dkim, dmarc)

Is below correctly setup? I have 1 A record mydomain.com pointing to an ip address. I have a subdomain called www.mydomain.com that also has the PTR record for the ip address (because i'm also going to host mail on it, i want it to helo/ehlo…
ATv
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How do email domains of From and Email Authentications (SPF, DKIM, etc) get compared by an email client?

Most of email clients shows "on behalf", "via" suffixes next to "From" email address if its domain differs from domains of Email Authentications ("Return-Path" email's domain for SPF, "d=" key value for DKIM, for instance). This raises…
origaminal
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