Miscellaneous first checks

• I checked that all ports are open and not blocked by my ISP / hosting provider.
• I know that SSL errors are likely the result of a wrong setup on the user side and not caused by DMS itself. I'm confident my setup is correct.

Affected Component(s)

Typo at documentation

What happened and when does this occur?

$ docker exec -it mailserver setup config dkim help
OPEN-DKIM(8)

NAME
    open-dkim - configure DomainKeys Identified Mail (DKIM)

SYNOPSIS
    ./setup.sh config dkim [ OPTIONS... ]

DESCRIPTION
    Configures DKIM keys. OPTIONS can be used to configure a more complex setup.
    LDAP setups require these options.

OPTIONS
    Generic Program Information
        help       Print the usage information.

    Configuration adjustments
        keysize    Set the size of the keys to be generated. Possible are 1024, 2024 and 4096 (default).
        selector   Set a manual selector (default is 'mail') for the key. (ATTENTION: NOT IMPLEMENTED YET!)
        domain     Provide the domain(s) for which keys are to be generated.

### What did you expect to happen?

```Markdown
`keysize    Set the size of the keys to be generated. Possible are 1024, 2048 and 4096 (default).`

Notice, it should be 2048

How do we replicate the issue?

1. `docker exec -it mailserver setup config dkim help`

DMS version

What operating system is DMS running on?

Linux

What instruction set architecture is DMS running on?

x86_64 / AMD64

What container orchestration tool are you using?

Docker Compose

docker-compose.yml

No response

Relevant log output

No response

Other relevant information

No response

What level of experience do you have with Docker and mail servers?

• I am inexperienced with docker
• I am inexperienced with mail servers
• I am uncomfortable with the CLI

Code of conduct

• I have read this project's Code of Conduct and I agree
• I have read the README and the documentation and I searched the issue tracker but could not find a solution

Improvements to this form?

No response