List all mailboxes to which a particular user has access

Get-Mailbox -resultsize unlimited | Get-MailboxPermission -User username@domain.com

Get-Mailbox -resultsize unlimited | Get-RecipientPermission -Trustee username@domain.com

Get-Mailbox -resultsize unlimited | ? {$_.GrantSendOnBehalfTo -match "user@principal.name"}

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Quickly list all mailboxes to which a particular user has access

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