DMARC – All Facts that you should know

DMARC – All Facts that you should know

DMARC, alias Domain-based Message Authentication, Reporting, and Conformance, is a technical standard that aids in protecting email users from any phishing or spam mail. Every email sender and receiver will get this benefit. An organisation can showcase its policy that informs its email authentication standards by using DMARC. It also helps the receiving mail servers regarding the ways to enforce these policies.

What is DMARC?

DMARC mentions the methods for every domain owner to publish the necessary practices for email authentication. It also mentions the actions that should be necessarily taken on mail. Permit to share the report of the actions taken by mail.

Individuals have the misconception that DMARC has its email authentication protocol. It does not have that protocol, but it is built on the SPF and DKIM, the prime authentication protocol.

Functionality of DMARC

DMARC is developed on the basic standards of SPF and DKIM, which are necessary for email authentication. The process of functioning DMARC is noticed as below.

Every domain administrator mentions the policy that defines email authentication. It also mentions how receiving email servers will handle emails that disrupt the standards.

How DMARC works

The inbound mail servers use the DNS to check the DMARC standards while it receives emails. Then these inbound servers make the necessary evaluation for the three key factors, and these are:

  • Whether the DKIM signature is valid or not
  • Whether the emails coming from the IP address are permitted by the SPF records of the sending domain or not.
  • Whether the headers of the message express exact domain alignment or not.

A brief on DMARC record

A DMARC record is added to the DNS database of an organisation, and this record is made based on the uniquely designed version of the standards of DNS TXT. Every DMARC record is denoted as _dmarc.mydomain.com. IN TXT v=DMARC1\; p=none\; rua=mailto:dmarc-aggregate@mydomain.com\; ruf=mailto:dmarc-afrf@mydomain.com\; pct=100

What is the Domain Alignment of DMARC?

Domain Alignment or DMARC is the concept that always helps to expand the validation of the Domain. The domain alignment of DMARC is always similar to the Domain with the necessary information relevant to the other standards.

  • The From Domain and the Return Path of the Domain of the messages should always match for SPF.
  • The From Domain and the DKIM d of messages should always match for DKIM.

Policies

DMARC p = standards or policies

These are three choices for DMARC specifications for all domain users. These policies are:

  • None: Here, the emails are considered similar to the emails without any DMARC validation.
  • Quarantine: As per this policy, mails are accepted, but these are placed in some other places in the inbox of the mail recipient.
  • Reject: As per this policy, the messages get rejected instantly.

Do you need DMARC?

Good question! If you are engaged in a business where you need to send commercial and transactional emails daily, you need to opt for email authentication. This will evaluate whether your emails are actually from your business. So, opting for DMARC is an important step that will enhance the deliverability of emails you send. For more information see MailSlurp documentation.

Related content

Fake SMTP servers for safe testing that prevent any outbound emails from reaching real users

Test emails safely with no risk of spamming users with real emails

Java email library for SMTP and creating email addresses

MailSlurp Java SDK for sending and receive email and attachments on the JVM.

SMTP email application libraries

How to send email in CSharp, PHP, Ruby, Java, Python, and NodeJS using the SMTP protocol and MailSlurp mailservers.

1111 SMTP Connections failing

1111 SMTP Connections failing

How to Send an Email in Python

Send emails using SMTP mailer in Python. Detailed tutorial for sending mail in Python.

How to send emails in Javascript (NodeJS)

JS SMTP email sending guide using HTML and NodeJS.

PHPMailer tutorial (Sending email with PHP)

PHPMailer tutorial (Sending email with PHP)

How to send an email using Powershell (Windows and cross-platform)

Use Send-MailMessage in Windows Powershell to send emails using an SMTP server or MailSlurp's free email API.

How to send email in R

RLang tutorial for sending emails over SMTP.

SMTP Commands and Response Codes List

A full list of commands and response status codes for SMTP mail servers when sending emails.

Test SMTP servers with Telnet

How to use Telnet to test the SMTP servers?

What Is Amazon Simple Storage Service (SES) - And How Can I Use It?

Amazon SES is an email service among virtual servers, AI apps, and libraries. Ideally, you can integrate your email system with your program hosted on Amazon.

Grab all details about an SMTP Port

What are common SMTP mail server ports and how do you find them?

Which SMTP Port Should I Use?

Picking the right port for SMTP mailservers

Avoiding email spam filters

How to send emails that don't trigger a spam warning.

BCC and CC in SMTP emails

What is cc and bcc in email? What is the difference between cc and bcc?

BCC For Email: What It Means And When To Use It

What is BCC email field (blind carbon copy) and how does it differ to CC?

What Is The Best SMTP Port To Use?

MailServers use TCP ports to transmit emails. Picking the right port between 25 vs 2555, 465 vs 587 in SMTP is easy with this guide.

How to configure Mail desktop clients with MailSlurp

How to setup MailSlurp with Outlook, Gmail, Thunderbird, Mail app and more.

Send email with CSharp using SMTP Client and MailSlurp

Create a custom SMTP client and access MailSlurp inboxes from CSharp/DotNET.

DMARC – All Facts that you should know

DMARC – All Facts that you should know

Email size limits

Email size limits

The Fundamentals Of Email Subdomains

How to manage email subdomain custom mailboxes using SMTP/IMAP mailserver settings.

How to send emails in VBA

Send email in Visual basic

A guide to PHP Mailer

A guide to PHP Mailer

SMTP IMAP Settings

How to access MailSlurp email accounts using IMAP and SMTP servers

SMTP Relay for outbound smtp servers

How to use SMTP relay to address spam and security issues that affect outbound mail servers.

SMTP vs HTTP MailSlurp inboxes

The difference between HTTP and SMTP inboxes and domains in MailSlurp.

What are SMTP ports

What are SMTP ports

CSharp send SMTP email

How to use CSharp SMTP client to send email with MailSlurp mail server

Send SMTP email with Java

How to use Java SMTP client to send email with MailSlurp mail server on the JDK

Send emails in NodeJS using SMTP

How to use Javascript SMTP client (or Nodemailer) to send email with MailSlurp mail server

Send SMTP emails with PHP

Use PHPMailer to send emails with SMTP and MailSlurp

Send SMTP email with Python (using SMTPLib)

How to send emails with Python's built-in SMTP client and MailSlurp mail servers.

Ruby send SMTP email

How to use Ruby SMTP client to send email with the MailSlurp mail servers

Ready to dive in?Start building email applications today.