You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config.go
    path of file: ./repos/fibratus/pkg/alertsender/mail
    
    the code of the file until where you have to start completion: /*
 * Copyright 2019-2020 by Nedim Sabic Sabic
 * https://www.fibratus.io
 * All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
    
func AddFlags(flags *pflag.FlagSet) {
	flags.String(host, "", "Represents the host of the SMTP server")
	flags.Int(port, 25, "Represents the port of the SMTP server")
	flags.String(user, "", "Specifies the user name when authenticating to the SMTP server")
	flags.String(pass, "", "Specifies the password when authenticating to the SMTP server")
	flags.String(from, "", "Specifies the sender's address")
	flags.StringSlice(to, []string{}, "Specifies all the recipients that'll receive the alert")
	flags.Bool(enabled, false, "Indicates whether mail alert sender is enabled")
	flags.String(contentType, "text/html", "Represents the email body content type")
}