icloud+ custom domain, can send mail but cannot receive mail

I tried to setup my custom domain icloud+ so I can use my domain for emails.

I received a confirmation from Icloud that my domain is set up correctly.

Now I can send emails from icloud (apple mail) with my new domain, but I am not able to receive emails anymore.

I was not able to set the "host" name in the settings of my domain provider ("@" or "sig1._domainkey") but as I received a confirmation from apple I thought everything is fine now.

The provider is netim, does anyone know how to do it?

Is there any support for the setup process?

I already read the manuals on the apple website, is there any other help?

TXT:

Record Type: TXT

Host: @

Value: [Enter the personal TXT record provided during setup]

SPF:

Record Type: TXT

Host: @

Value: "v=spf1 include:icloud.com ~all"

If you already have an SPF record, simply add "include:icloud.com" to the value before "~all".

MX:

Record Type: MX

Host: @

Value: mx01.mail.icloud.com.

Priority: 10

MX:

Record Type: MX

Host: @

Value: mx02.mail.icloud.com.

Priority: 10

DKIM:

Record Type: CNAME

Host: sig1._domainkey

Value: sig1.dkim.example.com.at.icloudmailadmin.com.