---
title: "Breaking: #97752 - MailerAdapterInterface removed"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-97752-1654761506"
source: "Changelog/12.0/Breaking-97752-MailerAdapterInterfaceRemoved.rst"
typo3-version: "12.0"
typo3-major: 12
type: "breaking"
issue: 97752
forge: "https://forge.typo3.org/issues/97752"
tags: ["PHP-API", "FullyScanned", "ext:core"]
rendered: "2026-09-29T06:32:46+00:00"
---

# Breaking: #97752 - MailerAdapterInterface removed {#breaking-97752-1654761506}

See [forge#97752](https://forge.typo3.org/issues/97752)

## Description {#description}

The `\TYPO3\CMS\Core\Mail\MailerAdapterInterface` has been removed,
since the interface became unused in v7 due to removal of Core's
`SwiftMailerAdapter` implementation, which had been used as hook
subscriber in the also removed `MailUtility::mail()` method.

## Impact {#impact}

Implementing the interface in custom extension code will trigger
a PHP Error.

## Affected installations {#affected-installations}

All installations implementing the interface in custom extension code,
which is very unlikely. The extension scanner will report any usage as
strong match.

## Migration {#migration}

Remove any usage of the interface in extension code.