You have the arguments for get_post_meta backwards. You have:
get_post_meta('imail', $post->post_id);
Whereas, where you to check the Codex, it should be:
get_post_meta( $post_id, $key, $single );
Or is your case:
get_post_meta($post->post_id,'imail');
That is assuming that $post is set correctly and that you are using the Gravity Forms hooks correctly.
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