What program was it you "signed up" for? Are you sending Hotmail via Outlook Express or using the website? OE has stationery backgrounds, but I'm not aware of this on Hotmail. Were there no instructions on the site you signed up to?
Galaxy Note 8 vs iPhone X
Awful clip art from 1994 is being tweeted every hour by a bot
iPhone X vs Samsung Galaxy Note 8
Les meilleurs navigateurs internet 2017