In Tip 224 we gave a solution for using email templates for signatures in emails sent from the CRM web interface. While this works, it is not automatic, and it has some limitations around logos and other formatting options.
Well you don’t need 224 anymore! CRM 2016 update 1 (aka spring wave) introduces email signature capabilities as a standard feature.
Click the gear icon in the upper right hand corner and click options. Then select the Email signatures tab and create your email signature.
Then, when composing an email in web client, your signature will appear by default.
Thanks to the MSCRMSHOP blog for alerting us to this little-known feature.