I can not receive any email reply after submitting a Portal Nomination successfully

in Report a Bug
I can not receive any email reply from Niantic after submitting a Portal Nomination successfully, no matter whether it was approved or rejected.
Maybe I had clicked a 'unsubscribe email notification' button anywhere, but how can I subscribe emails from Niatic again?
Note: the 'revice email' switch box in ingres scanner is checked now.
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