SharePoint 2019 – SMTP Authentication

SharePoint 2019 SMTP

Microsoft released the new Version of SharePoint 2019 and within there are several new features like the SMTP Authentication. This feature now allows to connect to SMTP Servers directly from SharePoint. There is no need to use an SMTP relay just configure the Outgoing Mailsettings via Central Administration or Powershell.

Configuration via User Interface

SharePoint 2019 SMTP

Simple and easy. But before SharePoint needs an application credential key. Therefore we need a Powershell script:

$key = ConvertTo-SecureString -AsPlainText -Force “myapplicationcredentialkey”
Set-SPApplicationCredentialKey $key

This has to be done on each SharePoint Server in the farm.

Configuration via Powershell

Open the Powershell App and use this script:

$CentralAdmin = Get-SPWebApplication -IncludeCentralAdministration | ? { $_.IsAdministrationWebApplication -eq $true }
$SmtpServer = “”
$SmtpServerPort = 587
$FromAddress = “”
$ReplyToAddress = “”
$Credentials = Get-Credential

Set-SPWebApplication -Identity $CentralAdmin -SMTPServer $SmtpServer -SMTPServerPort $SmtpServerPort -OutgoingEmailAddress $FromAddress -ReplyToEmailAddress $ReplyToAddress -SMTPCredentials $Credentials

After that you can use the outgoing email function.


The article or information provided here represents completely my own personal view & thought. It is recommended to test the content or scripts of the site in the lab, before making use in the production environment & use it completely at your own risk. The articles, scripts, suggestions or tricks published on the site are provided AS-IS with no warranties or guarantees and confers no rights.

About Karsten Schneider 312 Articles
Consultant for Microsoft 365 Applications with a strong focus in Teams, SharePoint Online, OneDrive for Business as well as PowerPlatform with PowerApps, Flow and PowerBI. I provide Workshops for Governance & Security in Office 365 and Development of Solutions in the area of Collaboration and Teamwork based on Microsoft 365 and Azure Cloud Solutions. In his free time he tries to collect tipps and worthy experience in this blog.

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