mailcow-dockerized-docs/docs/manual-guides/Postfix/u_e-postfix-attachment_size.en.md

Open data/conf/postfix/extra.cf and set the message_size_limit accordingly in bytes. See main.cf for the default value.

Restart Postfix: === "docker compose"

``` bash
docker compose restart postfix-mailcow
```

=== "docker-compose"

``` bash
docker-compose restart postfix-mailcow
```