Letsignit Add-in

by Letsignit

Easily deploy standardized signatures on Outlook

Enjoy a revolutionary experience to manage your email signatures on Outlook.

Letsignit was the first editor to co-develop an Add-In to manage signatures efficiently, directly with Microsoft

R&D teams. READ MORE

The Letsignit Add-In is a natively integrated add-in to Microsoft 365, which revolutionizes the deployment of

signatures on the desktops of hundreds or even thousands of employees simultaneously, all from the M365

administration center.


  • Simple, fast and even more secure deployment of Letsignit
  • Simultaneous deployment on OWA and Desktop
  • No user action required to benefit from Letsignit signatures
  • All Letsignit features at your fingertips

Main features

  • M365 SSO authentication: A single authentication method governed by the current M365 user session.

  • Automatic insertion of the main signature in the email: without any action from the user. With each new email, the Letsignit signature is inserted in the body of the email on Outlook Desktop and OWA.

  • Preview the signature before sending: view the signature in your email before sending it.

  • Automatically lightened signatures for reply/forward & multi-signature cases: employees can choose the most relevant signature and campaign according to their recipients...

  • Specific signature for internal exchanges. (available Q3 2021)

  • View and modify contact information: if authorized by the Letsignit administrator, the user can modify his contact information, the changes will be automatically reflected in your signature.

  • Upload profile picture: users can upload or modify their profile picture if the administrator allows it.


To use this add-in you must first create a Letsignit account. If you haven’t got a Letsignit account yet, click here to sign up to a free trial

App capabilities

When this app is used, it
  • Can send data over the Internet
  • This app can access and modify personal information in the active message, such as the body, subject, sender, recipients, and attachment information. It may send this data to a third-party service. Other items in your mailbox can’t be read or modified.
This add-in can launch itself when:
  • The user composes a new mail.
  • The user adds or removes recipients from an email.

At a glance