You may find this option especially useful if your email address is anything other than your name. Creating a standard block of text that Yahoo automatically adds to all of your outgoing messages saves you from having to type it each time. Your signature can include your contact info, website, or any other information you’d like your senders to have. You can also create multiple sign-offs and use them for different types of emails. For example, you can make one for personal emails and another for business. Along with the colors, you can pick out a theme–Light, Medium, or Dark–that sets the overall contrast of the screen. Light sets a white background with black text, while Dark gives you white text on a black background. While you’re at it, you can also specify which language Yahoo’s spell-checker uses. This option is handy to ensure that the platform uses the right dictionary when it’s checking your messages for typos. You can pick sizes ranging from “Tiny” to “Huge.” However, you’re probably best off picking something between that to make sure your emails are easy for their recipients to read. Yahoo Mail supports two-step authentication using unique, single-use codes. To add even more security to your account, you can bypass your password altogether with a Yahoo Access Key. You can access up to 50 email addresses with a single sign-in to Yahoo. They’ll all appear in the upper-left corner of your inbox, where you can switch between them with a single click. One example is if you want to keep all of your newsletters separate. Set a filter that will check incoming messages for the word “newsletter,” and you can quickly see when you receive new updates and keep them from crowding the rest of your inbox.