The webmail settings allow you to set a signature for all emails sent from the webmail portal. To do this, log into your email account and follow the steps below.
How-to
First, click the gear icon located in the lower left-hand corner to open your settings.
In the left-hand menu, under the "Mail" heading, select the “Signature” option.
Here, click "New signature" and enter the text you’d like to display in the “Signature text” field.
Lastly, select other settings you may want to enable for the signature and then click the "Save" button.