code:

$mailbox = 'yourname@company.com'
$searchphrase = '^ALERT - Timer'
$outfile = "C:\tmp\timer_alerts_$(get-date -UFormat “%Y_%m_%d_%H_%M_%S”).csv"

$outlook = New-Object -comobject Outlook.Application
$namespace = $outlook.GetNameSpace("MAPI")
$store = $namespace.Stores[$mailbox]
$inbox = $store.GetDefaultFolder([Microsoft.Office.Interop.Outlook.OlDefaultFolders]::olFolderInbox)
$root = $store.GetRootFolder()

$data = @()

Foreach ($email in $inbox.Items) {
    if($email.Subject -match $searchphrase) {
        $payload = @{ Time = ""; Machine = ""; Line = ""}
        if($email.Body -match "Machine Name: ([^<\s\r\n]*)") {
            $payload.Machine = $matches.1
        }
        if($email.Body -match "Line Number: ([^<\s\r\n]*)") {
            $payload.Line = $matches.1
        }
        $payload.Time = $email.SentOn | Get-Date -UFormat "%m/%d/%Y %R"

        $data += $payload
    }
}

$data | % {New-Object psobject -Property $_ } | Export-CSV $outfile -NoTypeInformation