More details please.
Is your email service with Gmail? Outlook? Yahoo? If you're just trying to delete a few dozen you can do this using the Contacts app on your device but if you've got a lot more than that to deal with, you might find it a lot easier to do this by logging into your email service account through a web browser on a computer. A larger screen and keyboard/mouse make sorting/merging/editing/deleting a little less of a hassle.
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