Sharepoint List Item permission based on Users DOMAIN

I have multiple suppliers who need to enter requests into a sharepoint list (by creating List Items). Rather than maintain separate lists, I want to consolidate into a single list - BUT I need each supplier so see/edit ONLY the items created by them. Note that there may be multiple USERS per SUPPLIER, who should be able to see/edit items created by other users within their own company / domain.

Can this be configured somehow?

I did think of creating a specific view for each supplier - filtered by the users email domain- and only send each supplier the URL of that view - with the "allitems" view url just having a more secure address eg ?view="view!*!all!*!items", for example - though I would need to "hide" those views from the view menu.

Any ideas?