Rediffmail is an email service that allows you to add your email account to desktop email clients via POP3 or IMAP. If you wish to create a Rediffmail account on your Android phone, use the Rediffmail app. For detailed instructions, go through these steps to know how to create a rediffmail account on Android.
In case you wish to add your Rediffmail email account to your Android phone, you need these settings.
Use these server settings to add your Rediffmail account manually to your Email app. Finally, know how to create a rediffmail account on Android.