>> Email headers in Outlook 2013
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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
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>> Email headers in Thunderbird
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Select the email, click on Other Actions > View Source
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>> Email headers in MacMail
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Select the email, go to the View menu > Message > Raw Source
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>> Email headers in App Suite (Namecheap Private Email)
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Select the email, click on Actions > View Source
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>> Email headers in Roundcube (webmail interface)
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Select the email, click on More > Show source
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>> Email headers in Horde (webmail interface)
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Select the email and toggle the Actions menu by clicking on the arrow next to the email subject.
You will see additional options in the right top corner of the email. Select Other Options > View source
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>> Email headers in Squirrelmail (webmail interface)
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Select the email and click on View Full Header
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>> Email headers in Gmail
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Select the email, click on the More button > choose Show original