How to view email headers

Email headers will tell the full transit story of a particular email. This can often help diagnose possible delivery or alignment issues.

Written by Nate
Updated over a week ago

Gmail Headers

Open mail.google.com
Open the email you wish to view the headers of.
On the top right of the email next to reply, click the three dots (more) -> Show original.

Source: https://support.google.com/mail/answer/29436

Outlook Web

Open outlook.live.com
Open the email you wish to view the headers of.
On the top right of the email, click the three dots -> View -> View message source.

Source: https://support.microsoft.com/en-us/office/view-internet-message-headers-in-outlook-cd039382-dc6e-4264-ac74-c048563d212c#tab=Web

Outlook App

Open Outlook.
Open the email you wish to view the headers of.
Click File -> Properties.
Headers will display in the "Internet headers" box.

Source: https://support.microsoft.com/en-us/office/view-internet-message-headers-in-outlook-cd039382-dc6e-4264-ac74-c048563d212c#tab=Newer_versions

Apple Mail

Open Apple Mail.
Open the email you wish to view the headers of.
Click View -> Message -> All Headers.
Headers will display in the window below your inbox.

Source: https://support.apple.com/guide/mail/show-detailed-email-headers-mlhlp1089/mac

Don't see your email client listed? Odds are that a quick search of your mail client's documentation will show you how to view email headers. If you're still having issues, give us a shout and we'll help you find them!

Contact Support