New Laposte Email Rules: What Senders Need to Know About SPF, DKIM, DMARC
Email authentication changes at Laposte.net
Laposte.net is one of France’s leading email service providers, operated by La Poste Group and serving millions of users with a private email address. As part of ongoing efforts to enhance email security and safeguard users from phishing and spoofing scams, laposte.net introduced mandatory email authentication requirements starting in September 2025.
The change was announced on August 22, 2025 in a LinkedIn post by Simon Bressier, Postmaster of laposte.net.
Anyone communicating with laposte.net email addresses is required to implement email authentication protocols SPF, DKIM and DMARC. Emails failing these checks will be considered spam, which may significantly impact deliverability if not remediated.
What are SPF, DKIM and DMARC?
- SPF (Sender Policy Framework) verifies the mail servers authorised to send messages on behalf of a domain.
- DKIM (DomainKeys Identified Mail) adds a digital signature to emails, allowing recipients to confirm the message’s integrity and source.
- DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM, instructing receiving servers on how to handle emails that fail authentication, thereby protecting domains against fraudulent use.
Why is this change important
Previously, some emails delivered with no authentication mechanisms could still reach user inboxes at laposte.net, increasing the risk of receiving phishing or spoofing emails.
Starting in September 2025, any emails that fail these checks will be sent directly to the spam folder. This means that if the sender’s email domain lacks proper SPF, DKIM and DMARC setup, messages may never arrive in the recipients’ inboxes.
This change is essential for deliverability, brand protection and maintaining trust with organisations’ recipients. It applies to all senders, whether individuals, businesses, or those sending transactional or marketing emails, with no exceptions.
If your organisation operates in France, there may be additional requirements regarding your email infrastructure. For more information, please check our page on DMARC mandates: https://dmarcian.com/dmarc-mandates/
Laposte.net Email Sender Requirements
| Requirement | Details |
| SPF | Must correctly identify all legitimate sending IPs. |
| DKIM | Emails must include valid DKIM signatures aligned with the sending domain. |
| DMARC | Publish and enforce a DMARC policy, starting with p=none |
| Feedback Loop | Regularly monitor your DMARC data to maintain sender reputation. |
How to prepare
- Simply audit your email domains to check if you have SPF, DKIM, and DMARC properly configured using our domain checker.
- Use a trusted platform like dmarcian’s to simplify setup and track authentication results.
- Reach out to the dmarcian team for personalised support and best practices to meet Laposte.net’s new requirements.
Starting early and staying informed will ensure your communications continue to flow smoothly in and out of laposte.net mailboxes after September 2025.
How dmarcian can help
With a team of email security experts and a mission of making email and the internet more trustworthy through domain security, dmarcian can help you assess your domain catalog, deploy DMARC and manage domain security for the long haul.
With our expertise and mission of DMARC for All, we can help you
- Understand how SPF, DKIM and DMARC work, and why they are essential.
- Configure these protocols to ensure seamless email delivery.
- Monitor authentication reports to identify and resolve any issues promptly.
- Progress safely from monitoring to enforcement with our expert guidance.
Want to continue the conversation? Head over to the dmarcian Forum.
