Email Signatures

In Gmail, click the settings gear icon on the upper right.

Click the button "See all settings."

Scroll down to the signature box.

Compose your signature using the "Recommended Format."

Use black text in "Sans Serif" font. Size normal. 

Click the "Insert Image" button on the signature toolbar.

Copy and paste the web address from below the image of the appropriate image at the bottom of this page. 

Select size "Medium" for the image/logo.

Be sure not to include any personal messages, logos or quotes.

After inserting and adjusting the size, put your typing cursor at the end, add a space and then backspace. Scroll down and click "Save Changes" at the bottom of the screen.