Mail User Agent

$hour = Get-Date -Format HH
$minute = Get-Date -Format mm
#no need to check mail before 8a.m. and after 6 p.m. office hours
#execute on every 30 mins
if( (($hour -ge 8) -or ($hour -le 18)) -and (( ($minute -eq 00) -or ($minute -eq 01) ) -or ($minute -eq 30)) )
{
    $ie = New-Object -ComObject InternetExplorer.Application
    $ie.Visible = $true
    $url = "https://myMailUrl.com/?Login"
    $ie.Navigate($url)
    Start-Sleep -Seconds 10
    $doc = $ie.Document
    $counter = 0
    #logic to retry 5 times
    while($doc -eq $null)
    {
        $ie.quit()
        $counter = $counter + 1
        ipconfig /flushdns
        Start-Sleep -Seconds 2
        netsh interface set interface “Local Area Connection DISABLE
        Start-Sleep 3
        netsh interface set interface “Local Area Connection ENABLE
        $ie = $null
        $ie = New-Object -ComObject InternetExplorer.Application
        $ie.Navigate($url)
        $doc = $ie.Document
        if($counter -eq 5)
        {
            [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
            [System.Windows.Forms.MessageBox]::Show("Error! Maybe Connection problems.")
            break
        }
        Start-Sleep -Seconds 2
    }
    $usernameInput = $doc.getElementsByName("Username")
    foreach($u in $usernameInput) {$u.value = "user.user@db.com"}
    $passInput = $doc.getElementsByName("Password")
    foreach($p in $passInput) {$p.value = "myPass"}
    $loginBtn = $doc.getElementsByTagName("input")
    foreach($i in $loginBtn) { if($i.Type -eq "submit") {$i.click()}  }
    Start-Sleep -Seconds 2
    $doc = $null
    Start-Sleep -Seconds 25
    $doc = $ie.Document
    $spans = $doc.getElementsByTagName("span")
    foreach($s in $spans) { if($s.InnerText -eq "Mail") {$s.click()}  }
    Start-Sleep -Seconds 2
    $doc = $null
    $doc = $ie.Document
    $refresh = $doc.getElementsByTagName("img")
    #refresh IN-mailbox
    foreach($i in $refresh) { if($i.Title -match "Click to refresh the current view") {$i.click()}  }
    Start-Sleep -Seconds 3
    $newMail = $false
    foreach($i in $refresh)
    {
        #active only if new inbox mails
        if($i.Title -match "Unread message ")
        {
            $ie.Visible = $true
            $newMail = $true
        }
    }
    if($newMail -ne $true)
    {
        $ie.Quit()
    }
}