Masuit.Tools/Masuit.Tools.Abstractions/Models/EmailAddress.cs

using DnsClient;
using System.Collections.Generic;
using System.Linq;
using System.Net;

namespace Masuit.Tools.Models;

public class EmailAddress
{
    public string Username { get; set; }

    public string Domain { get; set; }

    public List<IPAddress> SmtpServers
    {
        get
        {
            var nslookup = new LookupClient();
            var query = nslookup.Query(Domain, QueryType.MX).Answers.MxRecords().SelectMany(r => Dns.GetHostAddresses(r.Exchange.Value)).ToList();
            return query.FindAll(ip => !ip.IsPrivateIP());
        }
    }

    public EmailAddress(string email)
    {
        var parts = email.Split('@');
        Username = parts[0];
        Domain = parts[1];
    }

    /// <summary>
    ///
    /// </summary>
    /// <param name="email"></param>
    /// <returns></returns>
    public static implicit operator EmailAddress(string email)
    {
        return new EmailAddress(email);
    }

    /// <summary>
    ///
    /// </summary>
    /// <param name="email"></param>
    public static implicit operator string(EmailAddress email)
    {
        return email.ToString();
    }

    /// <summary>Returns a string that represents the current object.</summary>
    /// <returns>A string that represents the current object.</returns>
    public override string ToString()
    {
        return Username + "@" + Domain;
    }
}