---
title: "Breaking: #88643 - Removed swiftmailer/swiftmailer dependency"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-88643"
source: "Changelog/10.0/Breaking-88643-RemovedSwiftmailerswiftmailerDependency.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Breaking: #88643 - Removed swiftmailer/swiftmailer dependency

See [forge#88643](https://forge.typo3.org/issues/88643)

## Description

TYPO3's dependency swiftmailer has been removed in favor of new symfony-based
components "mime" and "mailer".

This means that all SwiftMailer-related PHP code has been removed.

## Impact

Custom SwiftMailer plugins or transports cannot be used without further
migration anymore and will result in a fatal `E_ERROR`.

Using SwiftMailer-specific API by using TYPO3's `\TYPO3\CMS\Core\Mail\MailMessage` class might result
in fatal `E_ERROR` when sending out emails.

## Affected Installations

Any TYPO3 installation with third-party extension sending out emails or extending
TYPO3's email sending capabilities.

## Migration

Search the third-party extensions' code for occurrences of MailMessage or
parts starting with `Swift_` and migrate to symfony/mime or symfony/mailer
APIs, which are included in TYPO3 v10.0.

If required, SwiftMailer code can be installed via composer (when running TYPO3 via composer)
via `composer require swiftmailer/swiftmailer`.