How do I find the headers of an email message?

What are email headers?

Email headers contain technical information about an email, such as:

• sender and sending mail server
• receiving server
• date & time
• SPF, DKIM and DMARC results
• IP addresses and the route of the email

👉 They are essential for:

• investigating spam or phishing
• problems with emails not arriving
• mail authentication (SPF/DKIM/DMARC)
• support tickets with hosting providers

Webmail

Roundcube Webmail

Steps:

1. Log in to Roundcube Webmail
2. Open the email concerned
3. At the top right, click ⋮ More
4. Choose Show source or Message source
5. A new window opens with the full headers

📌 Tip: Copy everything, including the Received: lines

💻 Desktop email programs

Microsoft Outlook (Windows)

Steps:

1. Open the email in a separate window
2. Click File
3. Choose Properties
4. Copy the text from the Internet headers field

Microsoft Outlook (Mac)

Steps:

1. Open the email
2. At the top, click Message
3. Choose Details → All Headers
4. Copy the full text

Apple Mail (macOS)

Steps:

1. Open the email
2. In the menu bar, click View
3. Choose Message → All Headers
4. For the full source: View → Message → Raw Source

Mozilla Thunderbird

Steps:

1. Open the email
2. Click More (or right-click the email)
3. Choose View Source
4. Or use the keyboard shortcut: Ctrl + U (Windows/Linux) / Cmd + U (Mac)

1. 📱 Mobile email apps

Gmail App (Android & iOS)

Steps:

1. Open the email
2. Tap ⋮ More
3. Choose Show original
4. Open the headers in your browser

⚠️ Not all headers are always visible in the app

Apple Mail (iPhone / iPad)

📌 Limited options

• iOS does not show full headers
• Use webmail or the desktop version for complete information

📋 What should you send to support?

Always send the full header, including:

• all Received: lines
• SPF/DKIM/DMARC results
• Message-ID

❌ No screenshots
❌ No partial copies

🧠 Common mistakes

• Copying only the top lines
• Editing or shortening headers
• Sending screenshots instead of text