# ====================================================================

# SendEmailTest_mail-tester.com.ps1

# ====================================================================

# PowerShell SMTP Authentication Test Script for mail-tester.com

#

# This script demonstrates how to send test emails using ZeroSMTP

# service (msgwing.com) to verify domain reputation on mail-tester.com.

#

# This script uses the Send-MailKitMessage module (built on MailKit)

# instead of the built-in Send-MailMessage cmdlet, which Microsoft marks

# Obsolete ("This cmdlet does not guarantee secure connections to SMTP

# servers."). Unlike Send-MailMessage, MailKit fully supports both

# port 587 (STARTTLS) and port 465 (Implicit SSL/TLS).

#

# Requirements:

# - Send-MailKitMessage module: Install-Module -Name Send-MailKitMessage -Scope CurrentUser

# - Active ZeroSMTP account at https://msgwing.com

# - Credentials for your @msgwing.com email address

# - Test email address from https://mail-tester.com

#

# Usage:

# 1. Register at https://msgwing.com and note your @msgwing.com email address

# 2. Register at https://mail-tester.com and get a unique test email address

# 3. Set the environment variables below with your credentials

# 4. Run this script in PowerShell

# 5. Check mail-tester.com for the reputation score and detailed report

#

# $env:ZEROSMTP_USERNAME="your-email@msgwing.com"

# $env:ZEROSMTP_PASSWORD="yourpassword"

# $env:ZEROSMTP_TEST_RECIPIENT="test-XXXXX@srv1.mail-tester.com"

# ./SendEmailTest_mail-tester.com.ps1

# ====================================================================

# ====================================================================

# CONFIGURATION SECTION

# ====================================================================

# NOTE: credentials are read from environment variables rather than

# hardcoded here, so real secrets are never accidentally committed to

# version control. Variable names are prefixed with ZEROSMTP_ to avoid

# colliding with reserved/OS-level variables (e.g. USERNAME is auto-set

# on Windows).

$SmtpServer = "mx.msgwing.com" # ZeroSMTP server

$SmtpPort = 587 # STARTTLS

$SmtpUser = if ($env:ZEROSMTP_USERNAME) { $env:ZEROSMTP_USERNAME } else { "your-email@msgwing.com" }

$SmtpPassword = if ($env:ZEROSMTP_PASSWORD) { $env:ZEROSMTP_PASSWORD } else { "your-password" }

$TestRecipient = if ($env:ZEROSMTP_TEST_RECIPIENT) { $env:ZEROSMTP_TEST_RECIPIENT } else { "test-XXXXX@srv1.mail-tester.com" }

# ====================================================================

# SCRIPT EXECUTION

# ====================================================================

Write-Host "`n=========================================" -ForegroundColor Cyan

Write-Host "ZeroSMTP Domain Reputation Test" -ForegroundColor Cyan

Write-Host "mail-tester.com Integration Script" -ForegroundColor Cyan

Write-Host "=========================================" -ForegroundColor Cyan

if (-not (Get-Module -ListAvailable -Name Send-MailKitMessage)) {

Write-Host "`n[ERROR] Send-MailKitMessage module is not installed" -ForegroundColor Red

Write-Host " Install it with: Install-Module -Name Send-MailKitMessage -Scope CurrentUser`n" -ForegroundColor Yellow

exit 1

}

Import-Module Send-MailKitMessage

# Convert plain text password to SecureString for credential object

try {

$SecurePassword = ConvertTo-SecureString -String $SmtpPassword -AsPlainText -Force

$SmtpCredential = New-Object System.Management.Automation.PSCredential($SmtpUser, $SecurePassword)

Write-Host "[OK] Credentials configured successfully" -ForegroundColor Green

}

catch {

Write-Host "`n[ERROR] Error configuring credentials" -ForegroundColor Red

Write-Host $_.Exception.Message -ForegroundColor Red

exit 1

}

# ====================================================================

# PORT 587 TEST (STARTTLS)

# ====================================================================

Write-Host "`n=========================================`n" -ForegroundColor Cyan

Write-Host "Testing SMTP Authentication - Port 587 (STARTTLS)" -ForegroundColor Yellow

Write-Host "=========================================`n" -ForegroundColor Cyan

Write-Host "Configuration:" -ForegroundColor Yellow

Write-Host " SMTP Server: $SmtpServer"

Write-Host " Port: $SmtpPort"

Write-Host " Authentication: STARTTLS (Explicit TLS, full certificate validation)"

Write-Host " From: $SmtpUser"

Write-Host " To: $TestRecipient`n"

try {

$MailFrom = [MimeKit.MailboxAddress]$SmtpUser

$RecipientList = [MimeKit.InternetAddressList]::new()

$RecipientList.Add([MimeKit.InternetAddress]$TestRecipient)

$Body = @"

This is a test email from ZeroSMTP (msgwing.com) service.

Send Date: $(Get-Date -Format "yyyy-MM-dd HH:mm:ss")

Test Email Address: $TestRecipient

Connection Method: STARTTLS (Port 587)

This email is being used to verify the domain reputation of msgwing.com

on mail-tester.com. Please check your mail-tester.com account for

detailed reputation analysis and scoring.

Email Authentication Checks:

- SPF (Sender Policy Framework)

- DKIM (DomainKeys Identified Mail)

- DMARC (Domain-based Message Authentication, Reporting and Conformance)

Thank you for using ZeroSMTP!

"@

Send-MailKitMessage `

-UseSecureConnectionIfAvailable `

-Credential $SmtpCredential `

-SMTPServer $SmtpServer `

-Port $SmtpPort `

-From $MailFrom `

-RecipientList $RecipientList `

-Subject "ZeroSMTP Test Email - mail-tester.com Reputation Check" `

-TextBody $Body

Write-Host "[OK] Email sent successfully on port 587 (STARTTLS)!" -ForegroundColor Green

Write-Host "`n Next Steps:`n" -ForegroundColor Green

Write-Host " 1. Log in to https://mail-tester.com"

Write-Host " 2. Check your test email address for the incoming message"

Write-Host " 3. Review the reputation score and detailed analysis"

Write-Host " 4. Check SPF, DKIM, and DMARC authentication results`n"

}

catch {

Write-Host "[ERROR] Error sending email on port 587" -ForegroundColor Red

Write-Host " Exception: $($_.Exception.Message)" -ForegroundColor Red

Write-Host "`n Troubleshooting Tips:`n" -ForegroundColor Yellow

Write-Host " - Verify your ZeroSMTP credentials"

Write-Host " - Ensure your @msgwing.com account is active"

Write-Host " - Check your network connectivity"

Write-Host " - Verify the mail-tester.com test email address is correct`n"

exit 1

}

# ====================================================================

# SUMMARY

# ====================================================================

Write-Host "=========================================`n" -ForegroundColor Cyan

Write-Host "Test Summary" -ForegroundColor Cyan

Write-Host "=========================================`n" -ForegroundColor Cyan

Write-Host "Email Test Results:" -ForegroundColor Yellow

Write-Host " Service: ZeroSMTP (msgwing.com)"

Write-Host " Domain: msgwing.com"

Write-Host " Sender: $SmtpUser"

Write-Host " Recipient: $TestRecipient`n"

Write-Host "What to Verify on mail-tester.com:" -ForegroundColor Yellow

Write-Host " [ ] SPF (Sender Policy Framework) - Authentication status"

Write-Host " [ ] DKIM (DomainKeys Identified Mail) - Signature verification"

Write-Host " [ ] DMARC (Domain-based Message Authentication) - Policy compliance"

Write-Host " [ ] Reputation Score - Domain trustworthiness"

Write-Host " [ ] Blacklist Status - Check for any listing issues"

Write-Host " [ ] TLS Version - Verify secure connection`n"

Write-Host "Supported Ports (via Send-MailKitMessage):" -ForegroundColor Yellow

Write-Host " - Port 587 (STARTTLS) - used by this script"

Write-Host " - Port 465 (Implicit SSL/TLS) - also supported, see pwsh-zerosmtp.ps1 / other language examples`n"

Write-Host "For more information:" -ForegroundColor Cyan

Write-Host " - ZeroSMTP: https://msgwing.com"

Write-Host " - Mail-tester: https://mail-tester.com"

Write-Host " - Report Issues: abuse@msgwing.com`n"

Write-Host "=========================================" -ForegroundColor Cyan

Write-Host "Script execution completed successfully" -ForegroundColor Cyan

Write-Host "=========================================" -ForegroundColor Cyan