Hi,

I'm needed to add a reply-to field & a bcc field to umbraco forms. I've created a custom workflow which is an extension of the "Send Email".

https://pastebin.com/SnfmDrSf

Simply create a new file in your app_code folder (can call it anything) say SendEmailExtended.cshtml

Go into umbraco forms and create a workflow! easy as that..

using System;
using System.Net.Mail;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Mvc;
using System.Xml;
using System.Xml.XPath;
using Umbraco.Forms.Core;
using Umbraco.Forms.Core.Attributes;
using Umbraco.Forms.Core.Enums;
using Umbraco.Forms.Data.Storage;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Contour.SharedSource.Providers.WorkflowTypes
{    
public class SendEmailExtended : WorkflowType
{
    [Umbraco.Forms.Core.Attributes.Setting("Email", description = "Enter the receiver email", view = "TextField")]
    public string Email { get; set; }

    [Umbraco.Forms.Core.Attributes.Setting("SenderEmail", description = "Enter the sender email (if blank it will use the settings from /config/umbracosettings.config)", view = "TextField")]
    public string SenderEmail { get; set; }

    [Umbraco.Forms.Core.Attributes.Setting("BCC", description = "Enter a BCC email address", view = "TextField")] 
    public string BCC { get; set; }

    [Umbraco.Forms.Core.Attributes.Setting("Reply To", description = "Enter a Reply-To email address", view = "TextField")] 
    public string replyTo { get; set; }

    [Umbraco.Forms.Core.Attributes.Setting("Subject", description = "Enter the subject", view = "TextField")]
    public string Subject { get; set; }

    [Umbraco.Forms.Core.Attributes.Setting("Message", description = "Enter the intro message",  view = "TextArea" )]
    public string Message { get; set; }


    public SendEmailExtended()
    {
        this.Id = new Guid("FC92552F-4063-4CC2-ACC9-B1DF7EEA151A");
        this.Name = "Send Email Extended";
        this.Description = "An extenstion of send email with functionality to BCC & Reply-To";
        this.Icon = "icon-message";
    }

    public override List<Exception> ValidateSettings()
    {
        List<Exception> l = new List<Exception>();
        if (string.IsNullOrEmpty(Email))
            l.Add(new Exception("'Email' setting not filled out'"));

        if (string.IsNullOrEmpty(Message))
            l.Add(new Exception("'Message' setting not filled out'"));


        return l;
    }

    public override WorkflowExecutionStatus Execute(Record record, RecordEventArgs e)
    {
        System.Net.Mail.MailMessage m = new System.Net.Mail.MailMessage();
        m.From = new System.Net.Mail.MailAddress(umbraco.UmbracoSettings.NotificationEmailSender);
        m.Subject = Subject;
        m.IsBodyHtml = true;

        // ATTACH EMAIL ADDRESS'
        if (Email.Contains(';'))
        {
            string[] emails = Email.Split(';');
            foreach (string email in emails)
            {
                m.To.Add(email.Trim());
            }
        }else{
            m.To.Add(Email);      
        }

        // ATTACH BCC ADDRESS'
        if (!string.IsNullOrEmpty(BCC)) { m.Bcc.Add(BCC); }

        // ATTACH REPLY TO ADDRESS'
        if (!string.IsNullOrEmpty(replyTo)) { m.ReplyToList.Add(replyTo); }

        /*RecordsViewer viewer = new RecordsViewer();
        XmlNode xml = viewer.GetSingleXmlRecord(record, new System.Xml.XmlDocument());*/

        var xml = record.ToXml(new System.Xml.XmlDocument());
        XPathNavigator navigator = xml.CreateNavigator();

        XPathExpression selectExpression = navigator.Compile("//fields/child::*");
        selectExpression.AddSort("@pageindex", XmlSortOrder.Ascending, XmlCaseOrder.None, "", XmlDataType.Number);
        selectExpression.AddSort("@fieldsetindex", XmlSortOrder.Ascending, XmlCaseOrder.None, "", XmlDataType.Number);
        selectExpression.AddSort("@sortorder", XmlSortOrder.Ascending, XmlCaseOrder.None, "", XmlDataType.Number);

        XPathNodeIterator nodeIterator = navigator.Select(selectExpression);

        string list = "<dl>";

        while( nodeIterator.MoveNext() ){

            list += "<dt><strong>" + nodeIterator.Current.SelectSingleNode("caption").Value + ": </strong><dt><dd>";

            XPathNodeIterator values = nodeIterator.Current.Select(".//value");

            while(values.MoveNext())
                list += values.Current.Value.Trim() + "<br/>";

            list += "</dd>";

        }

        list += "</dl>";

        m.Body = "<p>" + Message + "</p>" + list;

        System.Net.Mail.SmtpClient s = new System.Net.Mail.SmtpClient();

        s.Send(m);

        return WorkflowExecutionStatus.Completed;
    }
}
}

Cheers, Hayden