Create a file with ps1 extension, like send_mail.ps1, with this content:
# Make Windows negotiate higher TLS version:
[System.Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Send-MailMessage -From from@example.com -To to@example.com -Credential (Get-Credential) -Subject "Hello World" -Body "Your text here" -SmtpServer "smtp.office365.com" -Port 587 -UseSsl
With cred:
# Make Windows negotiate higher TLS version:
[System.Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$secpasswd = ConvertTo-SecureString "PlainTextPassword" -AsPlainText -Force
$Cred = New-Object System.Management.Automation.PSCredential ("username", $secpasswd)
$EmailTo = "myself@gmail.com"
$EmailFrom = "me@mydomain.com"
$Subject = "Test"
$Body = "Test Body"
$SMTPServer = "smtp.gmail.com"
Send-MailMessage -From $EmailFrom -To $EmailTo -Credential $Cred -Subject $Subject -Body $Body -SmtpServer $SMTPServer -Port 587 -UseSsl
