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Mail Tester
DMARC Checker

DMARC or Domain-based Message Authentication, Reporting & Conformance is an authentication mechanism based on an entry in DNS that tells the receiving email server to reject any messages that fails DMARC Validation. DMARC itself easy to set up and implement, but it depends on having SPF or DKIM set up (perferrably both). With DMARC it gives insight into how many emails are being sent as you that you didn't authorize though email reports. These email reports are sent to you daily and the information inside them will give you an idea of the different places that are pretending to be you, which is know as phishing and spoofing.  

A lot of people use third party companies to email on your behalf and if that third party company doesn't have a way to allow DMARC to pass, all your emails will end up being rejected. Most major third party mailers will sign emails with your DKIM Keys allowing DMARC to pass. You can start off by setting the reject policy on your DMARC to "none", to test what will happen. You will get reports - but no action will be taken if DMARC Fails.

Mail Tester will validate your DMARC Policy and let you know if you will pass or fail, it will test all aspects of your DMARC record from syntax to validation and flag each on as a critical. In the previous sections we talked about ADKIM and ASPF these are Email Identifier Alignment tests - Keep in mind only 1 must pass. You might see some critical errors, but the important line below is labels "DMARC PASSED" - if it's "Yes" you can ignore the critical errors in this section. If you're using a third party to send, you might not pass every test.

Resources: _DMARC Record
Tools: DMARC Wizard

The Mail Tester Pro Report  - DMARC Validation Section

Publication: RFC 7489
DMARC Record Syntax: Passed
DKIM Test: Passed
SPF Test: Passed
ADKIM Test: Passed
ASPF Test: Passed
RUA Test: Passed
RUF Test: Passed
DMARC Passed: Yes
Dmarc Record Location: Click Here: _dmarc.unlocktheinbox.com
DMARC Record: v=DMARC1;p=none;pct=100;aspf=s;adkim=s;rua=mailto:admin@domain.com;
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