Hi Matt,

On MemberService there is an event called Saving

When you hook into that, you will be able to cancel a member being created. This will allow you to "just" cancel the event, if the email-address does not meet your criteria.

In umbraco 8 you need to implement this with a composer. The documentation contains an example on how to listen for an event on ContentService - https://our.umbraco.com/Documentation/Implementation/Composing/#example---creating-a-component-to-listen-for-contentservicesaving-events

An example for your usecase whould be something like this

using System.Linq;
using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Core.Events;
using Umbraco.Core.Services;
using Umbraco.Core.Services.Implement;

namespace My.Website
{
    public class MemberServiceEventsComposer : IUserComposer
    {
        public void Compose(Composition composition)
        {
            // Append our component to the collection of Components
            // It will be the last one to be run
            composition.Components().Append<MemberServiceEventsComponent>();
        }
    }

    public class MemberServiceEventsComponent : IComponent
    {
        // initialize: runs once when Umbraco starts
        public void Initialize()
        {
            MemberService.Saving += MemberService_Saving;
        }

        // terminate: runs once when Umbraco stops
        public void Terminate()
        { }

        private void MemberService_Saving(IMemberService sender, SaveEventArgs<IMember> e)
        {
             foreach (var member in e.SavedEntities)
             {
                    if(!member.IsApproved && !member.Email.EndsWith("examle.com")){
                        e.Cancel = true;
                        return;
                    }

             }
        }
    }
}

This utilises the IsApproved flag, so members that are already created and approved, will not be validated.

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