/// <summary>
/// Reply to the client.
/// </summary>
/// <param name="client">The text stream to perform the operation on.</param>
/// <param name="response">The response.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>A task which performs the operation.</returns>
public static async Task ReplyAsync(this INetworkClient client, SmtpResponse response, CancellationToken cancellationToken)
{
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
await client.WriteLineAsync($"{(int)response.ReplyCode} {response.Message}", cancellationToken).ConfigureAwait(false);
await client.FlushAsync(cancellationToken).ConfigureAwait(false);
}