What Ben said. Trying to treat the situation differently will only create future problems and user confusion.
On a side note, you can also use the + trick with Gmail (e.g. johnsmith@gmail.com and johnsmith+devto@gmail.com go to the same mailbox). Other places allow the same thing but with dashes instead.
There are a lot of varieties - it's best not to try to manage them without a VERY good reason.
For further actions, you may consider blocking this person and/or reporting abuse
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What Ben said. Trying to treat the situation differently will only create future problems and user confusion.
On a side note, you can also use the + trick with Gmail (e.g. johnsmith@gmail.com and johnsmith+devto@gmail.com go to the same mailbox). Other places allow the same thing but with dashes instead.
There are a lot of varieties - it's best not to try to manage them without a VERY good reason.