Powershell script sends e-mail in ISE but not from powershell command line

Question

I have created a script that generates a report of all users who do not have photos in Active Directory. The script runs and sends an e-mail to a distribution list. It runs fine in ISE, but I cannot run it from command line or as a scheduled task. Any suggestions
what I am doing wrong?
#Starts Powershell Snap-In
Start-Transcript -path c:\Scripts\StaffWithoutPhotos.txt
add-pssnapin Microsoft.Exchange.Management.PowerShell.E2010 -erroraction silentlyContinue
$mailboxes = $null
$mailboxes = @(Get-Mailbox -OrganizationalUnit "Staff User Accounts" -ResultSize Unlimited | Where {$_.HasPicture -eq $False})
Write-Host $mailboxes
$report = @()
foreach ($mailbox in $mailboxes)
$mbObj = New-Object PSObject
    $mbObj | Add-Member -MemberType NoteProperty -Name "Display Name" -Value $mailbox.DisplayName
    $report += $mbObj
Write-Host "Diagnostic Output"
Write-Host "Before Mailbox value check"
Write-Host $report
Write-Host "After Mailbox Value check"
if ($mailboxes -ne $null)
    Write-Host $report
    #Send the report generated to the e-mail list specified above
    $style = "<style>BODY{font-family: Arial; font-size: 10pt;}"
    $style = $style + "TABLE{border: 1px solid black; border-collapse: collapse;}"
    $style = $style + "TH{border: 1px solid black; background: #dddddd; padding: 5px; }"
    $style = $style + "TD{border: 1px solid black; padding: 5px; }"
    $style = $style + "</style>"
    #Start-Sleep -Seconds 5
    $smtpserver = "MAIL.contoso.com"
    $msg = new-object Net.Mail.MailMessage
    $smtp = new-object Net.Mail.SmtpClient($smtpServer)
    $msg.From = "[email protected]"
    $msg.To.Add("[email protected]")
    #$msg.To.Add("[email protected]") #Used for testing
    $msg.Subject = "Staff without Photos report"
    $msg.Body = "This report contains the list of users who do not currently have photos."
    $msg.Body += "<p>"
    $msg.Body += "After photos are available for these users please submit a request to have their accounts updated or send an e-mail to <a href='mailto:[email protected]?Subject=Staff%20Photo%20Updates' target='_top'> [email protected]
</a> with <b>Staff Photo Updates</b> in the subject."
    $msg.Body += "<p>"
    $msg.Body += "This report runs on Fridays and will only send a message if we have Staff without Photos. For more information please contact your systems administrator."
    $msg.Body += "<p>"
    $msg.Body += $Report | ConvertTo-Html -Head $Style
    $msg.IsBodyHTML = $true
    $smtp.Send($msg)
Stop-Transcript

Answer 1

So after researching further and not receiving any more replies I decided to rewrite the script and attempt to use the send-mailmessage function. I have been unable to determine the reason for the original not script not working. We use a very similar script
to my original code which works to generate a report and e-mail that report as an attachment and it works without any problems.
After re-writing the script and using the send-mailmessage function I was able to get this report to work as expected. This has now been set up as a scheduled task to run on a server once a week. Here is the final code:
Start-Transcript -path c:\Scripts\StaffWithoutPhotos.txt
#Starts Powershell Snap-In
add-pssnapin Microsoft.Exchange.Management.PowerShell.E2010 -erroraction silentlyContinue
$mailboxes = $null
$mailboxes = @(Get-Mailbox -OrganizationalUnit "contoso Staff User Accounts" -ResultSize Unlimited | Where {$_.HasPicture -eq $False})
Write-Host $mailboxes
$report = @()
foreach ($mailbox in $mailboxes)
$mbObj = New-Object PSObject
    $mbObj | Add-Member -MemberType NoteProperty -Name "Display Name" -Value $mailbox.DisplayName
    $report += $mbObj
Write-Host "Diagnostic Output"
Write-Host "Before Mailbox value check"
Write-Host $report
Write-Host "After Mailbox Value check"
if ($mailboxes -ne $null)
    Write-Host $report
    #Send the report generated to the e-mail list specified above
    $style = "<style>BODY{font-family: Arial; font-size: 10pt;}"
    $style = $style + "TABLE{border: 1px solid black; border-collapse: collapse;}"
    $style = $style + "TH{border: 1px solid black; background: #dddddd; padding: 5px; }"
    $style = $style + "TD{border: 1px solid black; padding: 5px; }"
    $style = $style + "</style>"
    $smtpserver = "MAIL.contoso.com"
    $smtpFrom = "[email protected]"
    $smtpTo = "[email protected]" 
    $messageSubject = "Staff without Photos report"
    $Body = "This report contains the list of users who do not currently have photos."
    $Body += "<p>"
    $Body += "After photos are available for these users please submit a request to the Help Desk to have their accounts updated or send an e-mail to <a href='mailto:[email protected]?Subject=Staff%20Photo%20Updates' target='_top'> [email protected]
</a> with <b><u>Staff Photo Updates</b></u> in the subject."
    $Body += "<p>"
    $Body += "This report runs on Fridays and will only send a message if we have Staff without Photos. For more information please contact your systems administrator."
    $Body += "<p>"
    $Body += $Report | ConvertTo-Html -Head $Style
    #Send the report
    send-mailmessage -from "$smtpFrom" -to "$smtpTo" -subject "$messageSubject" -body "$Body" -smtpServer "$smtpserver" -BodyAsHtml
Stop-Transcript