Noms de domaine 18 Avril 2024 Créé par Aurélien 1mn de lecture

How to add a DMARC field to a domain name

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What is DMARC and how does it work?

DMARC(Domain-based Message Authentication, Reporting and Conformance) is a technical specification created by a group of organisations to help reduce the misuse of email, such as spam and phishing, by providing a solution for deploying and monitoring email authentication issues.

You can configure DMARC authentication by adding rules to your domain's DNS records, which define how your domain handles suspicious emails.

How does a DMARC field on a domain name work?

1. How a DMARC field works

A DMARC field on a domain name will look like this:

TXT @ v=DMARC1; p=quarantine; pct=5; rua=mailto:postmaster@votre_domaine.com

Common tags used in DMARC TXT records :

Tag	Mandatory	Description and values	Example
v	mandatory	Protocol version. This value must be DMARC1.	v=DMARC1
p	required	Defines how your domain handles suspicious messages: none: take no action on the message, log suspicious messages in the daily report quarantine: mark messages as spam and preserve them for later processing reject: cancel the message so that it is not sent to the recipient	p=quarantine
pct	optional	Defines the percentage of suspicious messages to which the DMARC rule applies. Suspicious messages are messages not validated by DMARC checks. The default value is 100.	pct=20
rua	optional	Creation of URI (Uniform Resource Identifier) reports for global reports. To obtain reports on DMARC activity for your domain, use this option with your own e-mail address.	rua=mailto:mail@exemple.com
sp	optional	Sets the rule for messages from subdomains of your main domain. Use this option if you wish to apply a different DMARC rule for your subdomains. The possible values are the same as for the p tag.	sp=reject
aspf	optional	Sets the alignment mode for SPF (ASPF) to determine the exact match required between message information and SPF signatures. The default value is relaxed. r: "relaxed" allows partial matches, for example subdomains within a domain. s: "strict" requires an exact match.	aspf=r

A few examples:

Take no action on messages that appear to come from your domain, but do not pass DMARC checks. Send the daily report to "postmaster@votre_domaine.com".

 v=DMARC1; p=none; rua=mailto:postmaster@votre_domaine.com

Quarantine 5% of messages that appear to come from your domain but do not pass DMARC checks. Send the daily report to "postmaster@votre_domaine.com".

 v=DMARC1; p=quarantine; pct=5; rua=mailto:postmaster@votre_domaine.com

Reject 100% of messages that appear to come from your domain but do not pass DMARC checks. Send the daily report to "postmaster@votre_domaine.com" and "dmarc@votre_domaine.com".

v=DMARC1; p=reject; rua=mailto:postmaster@votre_domaine.com, mailto:dmarc@votre_domaine.com

2. How to set up the default DMARC LWS field

1. go to your domain's admin area

2. Choose your domain name and click on"Manage".

How to add a DMARC field to a domain name

3. Click on the"DNS Zone" icon

How to add a DMARC field to a domain name

5. To add a DMARC record to a DNS zone, simply fill in the following fields :
.

TXT: Choose the type of Zone
Add a "_dmarc".
Enter the value for the DMARC field
Enter the TTL for your DNS Server
Click on the "Add" button

How to add a DMARC field to a domain name

In the"complex zone for experts", this will create a TXT field with the value of your DMARC record.

Conclusion

You can now add an SPF field to your domain name on your LWS shared hosting. The SPF allows you to send the list of servers authorised to send emails to the email service.

Don't hesitate to share your comments and questions!

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