Send-MailMessage on PowerShell does not work

Question

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 protected]" –Subject "Test E-Mail" –Body "FIRST EMAIL WITH POWERSHELL" –SmtpServer "smtp.gmail.com" –From "[email protected]"

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 protected]" 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 protected]"; -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?

As an aside: Send-MailMessage is considered obsolete, because it "does not guarantee secure connections to SMTP servers". If that isn't a concern in a given case, it still works and is unlikely to ever be removed, given PowerShell's commitment to backward compatibility. One modern alternative is the third-party Send-MailKitMessage cmdlet, which builds on the third-party MailKit library. — mklement0
– mklement0, Commented Jan 4, 2023 at 15:32

Sage Pourpre · Accepted Answer · 2020-01-23 01:15:29Z

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 protected]" $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 protected]" '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 )

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