chore: Block all email providers from being added as team domains (#3678)

server/models/TeamDomain.ts

@@ -1,9 +1,11 @@
+import emailProviders from "email-providers";
 import {
   Column,
   Table,
   BelongsTo,
   ForeignKey,
   NotEmpty,
+  NotIn,
 } from "sequelize-typescript";
 import Team from "./Team";
 import User from "./User";
@@ -13,6 +15,10 @@ import Fix from "./decorators/Fix";
 @Table({ tableName: "team_domains", modelName: "team_domain" })
 @Fix
 class TeamDomain extends IdModel {
+  @NotIn({
+    args: [emailProviders],
+    msg: "You chose a restricted domain, please try another.",
+  })
   @NotEmpty
   @Column
   name: string;