Redirect after registration / login based on domain name

I’m creating a site to offer multiple customers a “customized” site so that they can order products/services via a customized form.

1. I want to allow each customer to register with their own email address with no admin approval required. Captcha required.
2. On revisiting the site, I want them to simply enter their email address and password to login. (optional reset passwd)
3. I want to use their domain name via their email address (i.e. “@abccorp.com”) to re-direct to 1 to n customized forms (or a dashboard with options) within my WP site, with their own “customized” company fields.
4. If users register with a generic domain name, i.e. yahoo.com, gmail.com, etc. I will send them to a simple, generic order form and upsell them on the benefits of creating a custom page/”site”

I believe 1, 2 is doable, but what about 3 and 4 without requiring a dropdown menu item on register and login asking each time for their company name?

Also, is Gravity Forms a good choice for my custom forms?

Thanks for the advice.

Tim

https://www.ads-software.com/plugins/front-end-only-users/