How to send test email from all Exchange users (PowerShell)

When you set up a company-wide email signature on Exchange or Office 365 using, e.g. the built-in transport rules feature, you will probably want to verify whether it is correctly added to messages.

The most straightforward and foolproof method is for users to send a test email to you so you can check it.

Or, if you feel like taking a crowdsourcing approach, just have each user send the email to themselves and check the details, etc. personally.

The problem with both those methods is that they rely upon users correctly understanding your request, complying with it and carrying it out properly, all without assistance. Realistically, you have a higher chance of randomly meeting Bill Gates walking down your street with a pet iguana on a leash, than for all 3 of these circumstances to come together magically.

As in many cases, here also PowerShell scripts can save you a lot of time and effort.

The two scripts below utilize the Send-MailMessage cmdlet to send a test message from multiple Exchange/Office 365 users to either their own or your address.

Since company-wide email signatures are added on the level of the server, no additional actions need to be taken for the messages to be stamped with proper footers.

I included the –BodyAsHTML switch in both scripts because HTML emails are most common nowadays.

NOTE: If you are using a 3^rd party tool like CodeTwo Exchange Rules or CodeTwo Exchange Rules Pro you can take advantage of the Rules Tester feature to test your email signature.

Sending the test email to senders’ addresses

To learn how to remotely connect to Office 365 using PowerShell, see this article.

This script sends an email with the subject “Test of new company email signature” and body “Hello, Please check if your details are correct” from each user to themselves.

foreach ($Mailbox in (Get-Mailbox)) { $Name=$Mailbox.Name $UserSMTP=$Mailbox.PrimarySmtpAddress Send-MailMessage -To "$Name <$UserSMTP>" -From "$Name <$UserSMTP>" -Subject "Test of new company email signature" [-BodyAsHTML] -Body "Hello, Please check if your details are correct" –SmtpServer Your_SMTP_server_FQDN }

Sending the test email to one address

This script sends an email with the subject “Test of new company email signature” and body “Some text” from each user to a single (your) mailbox.

foreach ($Mailbox in (Get-Mailbox)) { $Name=$Mailbox.Name $UserSMTP=$Mailbox.PrimarySmtpAddress Send-MailMessage -To "Your_display_name <Your_SMTP_address>" -From "$Name <$UserSMTP>" -Subject "Test of new company email signature" [-BodyAsHTML] -Body "Some text" -SmtpServer Your_SMTP_server_FQDN }

Limiting the range of senders’

To limit the range of senders, use any of the Get-Mailbox cmdlet’s parameters.

Obviously, the one that allows for most precise targeting is the –Filter parameter. For example, to send messages from users belonging to only one department, use the following syntax:

…Get-Mailbox –Filter {Department –eq ‘Name_of_department’}…

Learn more about the Get-Mailbox cmdlet