Providers brand their portal and e-mails themselves — see Branding & messages. Two settings stay with kurnl, both under Providers → (pick a provider).

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Portal Domain

Serve a provider’s customer portal and its sign-in page on the provider’s own hostname, in its branding.
1

Enter the hostname

In the Portal Domain card, enter the Portal hostname (for example my.acme-fibre.ca). Clear the field to remove it.
2

Fill the legal links

Enter Imprint URL, Terms URL and Privacy URL. Without them the portal footer falls back to kurnl’s pages, which is wrong on a provider’s own domain.
3

Do the two manual steps

The certificate for the hostname is issued by hand, and the reverse proxy needs a proxy host forwarding it to the customer portal. Setting the field alone does nothing until both are in place.
The certificate does not renew itself. Note its expiry when you issue it.
The provider sees the domain read-only on its ISP Profile, with a link to preview the sign-in page.

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Sending Domain

A provider that connects its own SendGrid account sends from that account (see Email sending). Without one, customer e-mails go out from kurnl’s domain under the provider’s name — or, with this card, from the provider’s own domain.
1

Add the domain

In the Sending Domain card, enter the Email domain. E-mails then send from billing@, support@, status@, orders@ and noreply@ at that domain.
Sending domain settings

Per-provider sending domain

2

Verify, then enable

First complete SendGrid domain authentication for that domain and publish the DNS records SendGrid gives you. Only then tick Domain is verified — send from it. Until then, e-mails send from kurnl’s domain.
Don’t tick “verified” before the DNS records are live, or e-mails from that domain will bounce or land in spam.