Powershell - Send email when number of days reaches a set interval - powershell

Question

I'm at a blocker and need some help!
(New-Timespan -Start (Get-Date) -End (Get-AdfsCertificate -CertificateType Token-Signing | where-object { $_.IsPrimary -eq $true }).Certificate.NotAfter).Days
This returns a result of days until it is no longer a primary certificate. E.G simply "141"
How can I implement a way of looking at this result and sending an email when it reaches a certain day? E.G 20 days until it is no longer primary.
I can use a mail relay, so no credentials are required!
Many thanks in advance!

Answer 1

Put your code in a Task Schedule to run on a date and time, use an if/then code block to check the state, and send as needed when it meets your metric.
For example:
If ((New-Timespan -Start (Get-Date) -End (Get-AdfsCertificate -CertificateType Token-Signing |
where-object { $PSItem.IsPrimary -eq $true }).Certificate.NotAfter).Days -eq 20)
{
# Do something here
}
As for email, this is why the Send-MailMessage cmdlet exists.
Get-Help -Name Send-MailMessage -Full
Get-Help -Name Send-MailMessage -Examples
# Results
<#
NAME
Send-MailMessage
SYNOPSIS
Sends an email message.
# -- Example 1: Send an email from one person to another person --
Send-MailMessage -From 'User01 <user01#fabrikam.com>' -To 'User02 <user02#fabrikam.com>' -Subject 'Test mail'
The `Send-MailMessage` cmdlet uses the From parameter to specify the message's sender. The To parameter specifies the message's recipient. The Subject
parameter uses the text string Test mail as the message because the optional Body parameter is not included.
# ---------------- Example 2: Send an attachment ----------------
Send-MailMessage -From 'User01 <user01#fabrikam.com>' -To 'User02 <user02#fabrikam.com>', 'User03 <user03#fabrikam.com>' -Subject 'Sending the
Attachment' -Body "Forgot to send the attachment. Sending now." -Attachments .\data.csv -Priority High -DeliveryNotificationOption OnSuccess,
OnFailure -SmtpServer 'smtp.fabrikam.com'
The `Send-MailMessage` cmdlet uses the From parameter to specify the message's sender. The To parameter specifies the message's recipients. The
Subject parameter describes the content of the message. The Body parameter is the content of the message.
The Attachments parameter specifies the file in the current directory that is attached to the email message. The Priority parameter sets the message
to High priority. The -DeliveryNotificationOption parameter specifies two values, OnSuccess and OnFailure . The sender will receive email
notifications to confirm the success or failure of the message delivery. The SmtpServer parameter sets the SMTP server to smtp.fabrikam.com .
# ----------- Example 3: Send email to a mailing list -----------
Send-MailMessage -From 'User01 <user01#fabrikam.com>' -To 'ITGroup <itdept#fabrikam.com>' -Cc 'User02 <user02#fabrikam.com>' -Bcc 'ITMgr
<itmgr#fabrikam.com>' -Subject "Don't forget today's meeting!" -Credential domain01\admin01 -UseSsl
The `Send-MailMessage` cmdlet uses the From parameter to specify the message's sender. The To parameter specifies the message's recipients. The Cc
parameter sends a copy of the message to the specified recipient. The Bcc parameter sends a blind copy of the message. A blind copy is an email
address that is hidden from the other recipients. The Subject parameter is the message because the optional Body parameter is not included.
The Credential parameter specifies a domain administrator's credentials are used to send the message. The UseSsl parameter specifies that Secure
Socket Layer (SSL) creates a secure connection.
#>