User ManualSubscribers Gmail HelpHow to expose the hidden headers in Gmail

How to expose the hidden headers in Gmail

Most software programs only show key headers within the email message. For example:


Sometimes, when troubleshooting email delivery problems, we need to see ALL the headers. In particular, the Received Headers will show a step-by-step route that the email took along it's delivery path.

How to view headers in Gmail

  • Open the email in question.
  • Click the 3 dot Menu on the right side to show more options.

Open the email in question in Gmail

  • Choose Show Original.


How to read Received Headers

When reviewing Received Headers, start at the bottom and work your way up to trace the delivery path.

Received: by with SMTP id p20csp685660yba;

       Wed, 17 Aug 2016 10:08:07 -0700 (PDT)

Received: from ( [])

       by with ESMTPS id 19si20265380qkm.106.2016.

       for <>

       (version=TLS1_2 cipher=AES128-SHA bits=128/128);

       Wed, 17 Aug 2016 10:08:07 -0700 (PDT)

Received-SPF: pass ( domain of designates as permitted sender) client-ip=;

Received: from ([]) by

ip-10-232-151-47.ec2.internal with esmtps (Exim 4.82 #2) id 1ba4GF-0001TH-6K;

Wed, 17 Aug 2016 17:04:15 +0000

Received: from root by with local (Exim 4.82 #2) id

1ba4G6-0007Mo-HG for; Wed, 17 Aug 2016

17:04:06 +0000

Other headers with useful clues

Delivered-To, Return-Path, and Message-Id can contain helpful information.

For example, the Return Path domain should match the sender's domain. If it does not, it could be spam.


Return-Path: <>