for Windows

OutlookHeaders Add-in

Outlook add-in for modifying mail headers & outbound emails.

Version: 1.0.2
Compatibility: Microsoft Outlook 2007 for Windows, or later


App Icon OutlookHeaders is a simple Microsoft Outlook add-in for Windows that allows to adjust outbound email messages. The initial idea to write this add-in came from the need to specify special http header to enable Amazon SES tracking, i.e. X-SES-CONFIGURATION-SET, that Outlook did not support natively.

Overall this add-in can do the following:

  • Add arbitrary http headers to your outbound email messages.
  • Overwrite mail client name, so that your email doesn't appear to have come from Microsoft Outlook.
  • Suppress initial received: header, to prevent inclusion of the public IP address where the email was composed. (Outlook by default adds your public IP to every message.)
  • Adjust the format of your replies and forwarded emails to plaintext, or HTML, regardless of the format of the original message.
  • At the same time, if adjusting the format of an email to HTML, this add-in allows to adjust the Cascading Style Sheets (or CSS) for it.
  • This add-in also allows to automatically remove the tracking pixel from your replies and forwarded emails for specific domains.
  • All options listed above can be applied per individual email account, or for all accounts in Outlook.
  • This add-in supports automated installation, which allows to set it up from a pre-configured file.
  • This add-in supports non-interactive installation in an Active Directory environment, or on a corporate network via Group Policy Objects (or GPOs.)
  • To provide transparency for the enterprise & corporate users, this project is available as open source.


Read here for details of the installation process.


Review the following screenshots of the OutlookHeaders Add-in software:


Available online.



Totally free. Customization available.


You may use this software for as long as you need it, make as many copies of the downloaded package as required, and distribute it among any people and organizations at no cost.

You are NOT ALLOWED to modify or rename any parts of the downloaded package and/or the manual within it; distribute it under a different title and/or author's name; repackage or re-distribute separate components of the downloaded package; sell, rent or receive any financial gain from this software.


The authors of this web site and of this particular software guarantee that this computer program does not contain any intentionally deleterious or harmful material that may somehow adversely affect your system. All software posted on this web site is custom-built computer programs that were designed primarily for our personal use. We test it for some time before posting it here. In spite of that and due to the fact that we are human, we do not exclude a possibility for this software to contain errors and unintended bugs that may present misinformation in programmatic sense and/or may temporarily affect your computer's stability. If such is the case, let us know through the feedback on this site and we will do our best to correct the problem and supply you with the latest update.

And last, by downloading and using this software you agree to do so "as is" without any implied or expressed liability from the authors and/or distributors of this software.

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Installer (Bundle)
Installer (Per User) - for non-interactive installation. More details.
Installer (All Users) - for non-interactive installation. More details.
Source Code

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