What is email spoofing?

Email spoofing is a fraudulent technique used to make it appear

that an email comes from a legitimate address when it was actually sent by a malicious third party.

This type of attack is often used to:

• deceive the recipient,
• spread viruses or malicious links,
• or obtain confidential information (phishing).

How to tell if an email has been spoofed?

Here are some signs that may alert you:

• The sender appears to be a legitimate address, but the content is strange or suspicious.
• The email contains errors, suspicious attachments, or urges you to act urgently.
• You were not expecting any email from this person or company.
• As the domain name owner, the address used is unknown to you.

How to retrieve the technical information of the email (headers or raw source) to send to us?

This information will allow us to analyze the actual origin of the email and confirm whether or not it is fraudulent.

On webmail:

• Select the email.
• In the "More" ribbon, click the "View Source" button.
• A new window opens; copy and paste its content into your request.

On Outlook:

• Select the email.
• In the "Message" ribbon, click the "Actions" or "Other Move Actions" button, select "Other Actions" then "View Source".
• A new window opens; copy and paste its content into your request.

On Apple Mail:

• Select the email.
• In the menu, click "View" > "Message > All Headers" or "Raw Source".
• Copy and paste this section into your request.

On Thunderbird:

• Select the email.
• In the menu, click "More" > "View Source".
• A new window opens; copy and paste its content into your request.

Send us the source of the suspicious email via:

Open a request

How can I protect my domain name against spoofing?

To protect your domain against spoofing, we recommend following best practices in

DNS security (SPF, DKIM, DMARC).

Check out our FAQs on the subject:

How to prevent domain name spoofing?

How to improve your email deliverability?

Updated on: 14/02/2026