Note: Make sure you are using either Google Chrome or Firefox during the installation process. Create your email signature on NEWOLDSTAMP.com and follow these simple steps to install it in FastMail.
After you finish creating your email signature, click “Save and Install” button under the signature preview:
Or if you have saved your signature priorly, hover over your signature on the dashboard and click “Use” button. Choose the way you want to install the signature on the pop-up window(following instructions are if you choose “Use by Myself”:
Select the Outlook icon in the list of email clients.
Scroll down the Signature Preview and Click the “Copy and Proceed” button, which will save the signature code in the clipboard.
Open your browser and log in to your Outlook.com
Open Quick settings and choose “View all Outlook settings” at the bottom.
Settings will open up in the Mail tab (which we need). Then choose “Compose and reply”. The signature section will be right there.
Paste the signature in the signature section.
Note: Make sure to put the tick in two options under to make sure your signature will show up in your composed/forwarded/replied emails.
Save the changes and close the settings window.
Compose a new email and see how the signature looks like there.
Congrats! Now you can use your email signature in every email in Outlook.com