---
title: "TLS Protocol in Office 365 Causing Mail Output Failure"
slug: "tls-protocol-in-office-365-causing-mail-output-failure"
description: "Microsoft has recently made a change to its TLS handling protocol. This has resulted in a connection failure with the Lasernet Mail Output port. The article describes a solution."
tags: ["Lasernet", "Mail output", "SMTP"]
updated: 2025-12-01T11:06:18Z
published: 2025-12-01T11:06:18Z
canonical: "kb.lasernetgroup.com/tls-protocol-in-office-365-causing-mail-output-failure"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.lasernetgroup.com/llms.txt
> Use this file to discover all available pages before exploring further.

# TLS Protocol in Office 365 Causing Mail Output Failure

> [!NOTE]
> Note
> 
> This article describes an issue that was fixed in a previous Lasernet release. This article will be retained for reference purposes but will no longer be updated. If you have any questions, contact [Lasernet Support](https://support.lasernetgroup.com/new-ticket).

Microsoft has recently made a change to its TLS handling protocol. This has resulted in a connection failure with the Lasernet Mail Output port when using SMTP with Office365.

When **TLS 1.2 or higher** is selected, the connection fails:

![](https://cdn.document360.io/c831ef63-c6b3-48ee-b443-3e33644e4e2e/Images/Documentation/image-VOE51F6L.png)

## Solution

To solve this connection failure, ensure that users change the TLS setting by selecting **TLS 1.2** and then **Commit**/**Deploy**.

![](https://cdn.document360.io/c831ef63-c6b3-48ee-b443-3e33644e4e2e/Images/Documentation/image-63EKGHVW.png)