Check POP3 or IMAP Email from Web Browser with Mail2Web
Mail2Web offers a free online service that allows you to check your POP3 and IMAP based email account using your web browser instead of an email client software.
Raymond
Online Services
14 Free Temporary Email Address Sites [One Day, Week, Month]
If you are forced to provide an email address to access a restricted service or webpage and not comfortable in providing your personal email address, you can make use of temporary email services where you can instantly get an email address that expires after a certain period.
HAL9000
Online Services