When you send an email, you can put a signature at the end of it. This can be set up so it always appears. Why would you want it?
It can put in the name and address of your firm, telephone number etc.
It can put in the URL for your website.
It can include a mission statement or some advertising.
It can include a logo or photograph.
When you create a new email message, you will be able to see a number of options in the header. One of them is called “signature”. It is about two thirds the way along from the left. Right click on this and you should be able to set up a signature for yourself containing any of the above, plus anything else you can think of. An email signature always looks business-like and you can use it for free advertising.