$Recipient = "contact@domain.com"
$Subject = "Hello, World!"
$Body = "This is the body of the email."
$credentials = Get-Credential
Send-MailMessage -To $Recipient -Subject $subject -Body $body -From $credentials.UserName -SmtpServer "smtp.office365.com" -Port 587 -UseSsl -Credential $credentials
-----------------
Using saved/exported password:
# $credentials.Password | ConvertFrom-SecureString | out-file L:\Downloads\senha.sec
$sen = Get-Content L:\Downloads\senha.sec | ConvertTo-SecureString
$us = "sender@mydomain.com"
$em = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $us,$sen
Send-MailMessage -To $Recipient -Subject $subject -Body $body -From $us -SmtpServer "smtp.office365.com" -Port 587 -UseSsl -Credential $em
