PowerShell - SMTP Send

Question

So I have a encrypted string stored in a text file that I can call again and again, this is the password for my SMTP Smart Host. This is created via:

Read-Host "Enter the Password:" -AsSecureString | ConvertFrom-SecureString | Out-File C:\EncPW.bin

I now need to somehow pass this along with a $username to a -Credential parameter for a Send-MailMessage function. I assume I need to get this into a PSCredential format. But I'm stuck !

$password = cat C:\encPW.bin | ConvertTo-SecureString $password $cred = New-Object -typename System.Management.Automation.PSCredential -argumentlist $username,$password

As of now I have this, but it $password when I print it outputs System.Security.SecureString and I get an error:

net_io_connectionclosed

When it tries to SMTP send.

Cheers

CALL to SMTP Send:

Send-MailMessage -from "[email protected]" -To "[email protected]" -Subject "Daily Report" -Body "Open Attachment for Report" -smtpServer 85.119.248.54 -Attachments "C:\WSB_Reports\DailyReport.txt" -Credential $cred

securestring can not be printed out(that's the "secure" part). What have you tried? Send-MailMessage .... -Credential $cred ? Is this what outputs the error? — Frode F.
– Frode F., Commented Dec 21, 2012 at 17:51
Yeah - then I get: Send-MailMessage : Unable to read data from the transport connection: net_io_connectionclosed. — PnP
– PnP, Commented Dec 21, 2012 at 17:55
have you tried using a new credential without using Your password-bin file. just to test. $creds = Get-Credential — Frode F.
– Frode F., Commented Dec 21, 2012 at 18:04
Can Send-MailMessage use SMTP servers external to the LAN the script runs on? i.e. a Smart Host — PnP
– PnP, Commented Dec 21, 2012 at 18:16
I'm pretty sure it can as long as you don't have some firewall between you and the server blocking port 25. — Keith Hill
– Keith Hill, Commented Dec 21, 2012 at 18:18

Keith Hill · Accepted Answer · 2012-12-21 18:16:55Z

The approach you're taking appears correct assuming your username and password are correct. Is your username prefixed with the domain e.g. domain\username? I second the suggestion to try the command with a manually supplied credential via Get-Credential e.g.:

$cred = Get-Credential

If you need to verify the password coming back from the secure string is correct, you can display it like so:

$bstr = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($password) $str = [System.Runtime.InteropServices.Marshal]::PtrToStringBSTR($bstr) [System.Runtime.InteropServices.Marshal]::ZeroFreeBSTR($bstr) $str

I have tried with Get-Credential and have the same error - see my comment on the above post. Thanks :)
Try this - telnet mailserver.domain.com 25 and see if you can even reach the machine's SMTP port.
Are you sure your credentials give you permission to use the mail server?

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