---
title: "Development"
manual: "Microsoft Exchange 365 Mailer"
version: "main"
permalink: "https://docs.typo3.org/permalink/oliverkroener/ok-exchange365-mailer:development@main"
source: "Development/Index.rst"
rendered: "2026-10-04T20:03:13+00:00"
---

# Development {#development}

Reference material for contributors and for integrators who need to understand how
the transport resolves its configuration.

![Architecture diagram icon](/Images/Icons/architecture.svg)

**Architecture**

How TYPO3 selects the transport, how configuration is resolved, and how the
sender mailbox is determined.

[Read more](https://docs.typo3.org/permalink/oliverkroener/ok-exchange365-mailer:architecture@main)

![Code brackets icon](/Images/Icons/development.svg)

**Testing**

Run the automated cross-version test matrix against TYPO3 10 through 14.

[Run the tests](https://docs.typo3.org/permalink/oliverkroener/ok-exchange365-mailer:testing@main)