C# Pop3 CLient

Pop3Client.cs

public interface IPop3Client : IDisposable {
		void Connect();
		List<string> GetMessageUids();
		MessageHeader GetMessageHeaders(int messageNumber);
		Message GetMessage(int messageNumber);
		IEnumerable<Message> FetchMessagesLike(string emailedToRegex);
		IEnumerable<Message> FetchMessagesFrom(string[] to);
		void DeleteMessage(int messageNumber);
		void DeleteMessages(IList<Message> messages);
	}

	public class CustomPop3Client : IPop3Client
	{
		private readonly string _hostname;
		private readonly string _email;
		private readonly string _password;
		private Pop3Client _client;

		public CustomPop3Client(string hostname, string email, string password)
		{
			_hostname = hostname;
			_email = email;
			_password = password;

			_client = new Pop3Client();
			
		}

		public void Connect()
		{
			_client.Connect(_hostname, 110, false);
			_client.Authenticate(_email, _password);
		}

		public List<string> GetMessageUids()
		{
			return _client.GetMessageUids();
		}

		public MessageHeader GetMessageHeaders(int messageNumber)
		{
			return _client.GetMessageHeaders(messageNumber);
		}

		public Message GetMessage(int messageNumber)
		{
			return _client.GetMessage(messageNumber);
		}

		public IEnumerable<Message> FetchMessagesLike(string pattern)
		{
			var hdrs = FetchAllMessageHeaders();
			var matchingMessages = new List<Message>();
			var toRegex = new Regex(pattern, RegexOptions.IgnoreCase);

			for (var i = 0; i < hdrs.Count(); i++)
			{
				var to = hdrs.ElementAt(i).To.First().MailAddress.Address;
				
				if (toRegex.IsMatch(to))
				{
					var matchingMessage = _client.GetMessage(i + 1);
					matchingMessages.Add(matchingMessage);
					
				}
			}
			return matchingMessages;
		}

		public IEnumerable<Message> FetchMessagesFrom(string[] toAddresses)
		{
			var hdrs = FetchAllMessageHeaders();
			var matchingMessages = new List<Message>();
			

			for (var i = 0; i < hdrs.Count(); i++) {
				var to = hdrs.ElementAt(i).To.First().MailAddress.Address;

				if (toAddresses.Contains(to,StringComparer.InvariantCultureIgnoreCase)) {
					var matchingMessage = _client.GetMessage(i + 1);
					matchingMessages.Add(matchingMessage);
					DeleteMessage(i + 1);
				}
			}
			return matchingMessages;
		}

		public IEnumerable<MessageHeader> FetchAllMessageHeaders()
		{
			var uids = _client.GetMessageUids();
			var msgHeaders = new List<MessageHeader>();

			for (var i = 0; i < uids.Count; i++) {

				var hdrs = _client.GetMessageHeaders(i + 1);
				msgHeaders.Add(hdrs);
				
			}

			return msgHeaders;
		}

		public void DeleteMessage(int messageNumber)
		{
			_client.DeleteMessage(messageNumber);
		}

		public void DeleteMessages(IList<Message> messages)
		{
			var uids = _client.GetMessageUids();

			for (var i = 0; i < uids.Count; i++)
			{
				var hdrs = _client.GetMessageHeaders(i + 1);

				var messageToDelete = messages.SingleOrDefault(m => m.Headers.MessageId == hdrs.MessageId);

				if(messageToDelete != null)
					_client.DeleteMessage(i);
			}
		}

		public void Dispose()
		{
			_client.Disconnect();
		}
	}