Email headers in Outlook 2013
Email headers in Thunderbird
Email headers in MacMail
Email headers in App Suite (Namecheap Private Email)
Email headers in Roundcube (cPanel email)
Email headers in Outlook
Email headers in Outlook 2016 for Mac
Email headers in Gmail
Email headers in Yahoo
Email headers in Aol Mail
The email header contains metadata about the email message such as information about the place, time, and way the message is sent and transmitted between the mail servers.
Usually, the full email source is needed for investigating email-related issues as it includes the complete content of the email, including both the header and the body of the message.
If you need to share an email source, we recommend pasting it into a text file (e.g. .txt, .pdf) to make sure it is not corrupted while being processed by text redactors.
Here's a video guide on how to get the full email header using Roundcube, Thunderbird, Yahoo, and Gmail:
Alternatively, you can lso find corresponding text instructions below.
Email headers in Outlook 2013
Double-click on the message to open it in the new window.
From the Files tab select Info > Properties. Full email headers are located inside the Headers box:

Email headers in Thunderbird
Select the email, click on Other Actions > View Source:

Email headers in MacMail
Select the email, go to the View menu > Message > Raw Source:

Email headers in App Suite (Namecheap Private Email)
Select the email, click on Actions > View source:

Email headers in Roundcube (cPanel email)
Select the email, click on More > Show source:

Email headers in Outlook
Select the email, click on More > View message source:

Email headers in Outlook 2016 for Mac
Right-click (or ctrl-click) the message in your Inbox or other folder without opening the message.
From the menu that appears, select View Source:

Email headers in Gmail
Select the email, click on the More button > choose Show original

Email headers in Yahoo
Select the email, click on the More icon > View raw message

Email headers in Aol Mail
Select the email, click on Action > View Message Source

That's it!
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