Using AutoText for signatures:

Email signatures can be created using email templates or AutoText.

To create an AutoText signature, type the details into the body of the email (or paste in your normal signature). Highlight the text then click AutoText:

Give your AutoText entry a meaningful name:

AutoText is saved for the logged-in user. Once you've created your AutoText entries, you can select them from the list. This will insert the saved text directly into your email message.