Yahoo Mail is the most popular email application, many people’s across the globe. It is a trustable webmail service because of its greatest security level they provide and complete authenticity services. Yahoo Mail offers a variety of features, including the ability to check your email from any smart device like Smart Phone (iPhone / Android), Laptop and Desktop ( Windows or Mac) with an Internet connection, POP and IMAP access, a built-in address book, and support it also support for attachment files.  However, at times, you may get problems accessing it. Some of the most common reasons Yahoo's incoming mail server settings ,one possibility is that your account has been hacked and the settings have been changed. Another possibility is that you have entered your settings incorrectly, or broken SSL/TLS certificates, failed directory synchronization and updating the configuration file.