Hi all,
I've blogged about this before here, but Microsoft have updated the limit from 200 proxy addresses to 400. So whilst this isn't rocket science I thought I would update my post and also put the updated PS command here.
To check for on-premises Exchange recipients with more than 400 proxy addresses (email addresses) use this command.
Get-Recipient -ResultSize unlimited | Where {($_.EmailAddresses).count -gt 400}
You can read more about the update in a Microsoft blog post here.