Removing http:// from esc url() for wordpress customizer code

Because an email isn’t a URL; you need to prepend the protocol to the value you pass to esc_url:

<a href="https://wordpress.stackexchange.com/questions/227925/<?php echo esc_url("mailto:' . get_theme_mod( 'header_utility_right_email_block_link' ) ) ?>" ...

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