Send-MailMessage on PowerShell does not work

I have a big problem. For a school club I have to write a script which sends emails automatically. I decided to use PowerShell for that.

My Code:

Send-MailMessage –To "email@outlook.com" –Subject "Test E-Mail" –Body "FIRST EMAIL WITH POWERSHELL" –SmtpServer "smtp.gmail.com" –From "email@gmail.com"

My error code:

Send-MailMessage: The SMTP server requires a secure connection or the client has not been authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. o3sm51888528wrs.30 - gsmtp In line: 1 character: 1 + Send-MailMessage -To "email@outlook.com" Subject "Test E-Mail" -Bod ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~ + CategoryInfo: InvalidOperation: (System.Net.Mail.SmtpClient: SmtpClient) [Send-MailMessage], SmtpException + FullyQualifiedErrorId: SmtpException, Microsoft.PowerShell.Commands.SendMailMessage

And if I write

–SmtpServer "gsmtp.gmail.com"

the error code is:

Send-MailMessage : The connection to the remote server cannot be established. In line:1 character:1 + Send-MailMessage -To "email@outlook.com"; -Subject "Test E-Mail"; -Bod . . . + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (System. Net. Mail. SmtpClient:SmtpClient) [Send-MailMessage], SmtpException + FullyQualifiedErrorId : SmtpException,Microsoft. PowerShell. Commands. SendMailMessage

Do you know what´s the problem?

First, you will need to enable "less secure apps" in your Google account settings. To do so, click on the following link, then set the Allow less secure apps setting to ON.

Once this is done, you can send your message with Send-MailMessage. Here's a working example.

$MyEmail = "email@gmail.com"
$creds = get-credential -Message 'Enter your email credentials' -Username $MyEmail
$ServerParams = @{
    SmtpServer = "smtp.gmail.com"
    From = $MyEmail
    Port = 587
    UseSsl = $true
    Credential =  $creds
}

$MessageParams = @{
    'To' = "email@outlook.com"
    'Subject' = "Test E-Mail"
    'Body' = "FIRST EMAIL WITH POWERSHELL"
}

Send-MailMessage @ServerParams @MessageParams

Bonus: For a better readability and reusability, you can splat your parameters

(Reference:About Splatting )