export interface Smtp {
    // smtp_trans_depth	int	Depth of email into SMTP exchange	2
    // smtp_headers_helo	string	Helo header	"somestring"
    // smtp_headers_mailfrom	string	Mailfrom header	"somestring"
    // smtp_headers_rcptto	string	Rcptto header	"somestring"
    // smtp_headers_date	string	Header date	"somestring"
    // smtp_headers_from	string	From header	"somestring"
    // smtp_headers_to	string	To header	"somestring"
    // smtp_headers_reply_to	string	Reply to header	"somestring"
    // smtp_headers_msg_id	string	Message ID	"somestring"
    // smtp_headers_in_reply_to	string	In reply to header	"somestring"
    // smtp_headers_subject	string	Subject	"somestring"
    // smtp_headers_x_originating_ip4	bigint	Originating IP address	1203743731
    // smtp_headers_first_received	string	First to receive message	"somestring"
    // smtp_headers_second_received	string	Second to receive message	"somestring"
    // smtp_last_reply	string	Last reply in message chain	"somestring"
    // smtp_path	string	Path of message	"somestring"
    // smtp_user_agent	string	User agent	"somestring"
    // smtp_tls	boolean	Indication of TLS use	1
    // smtp_is_webmail	boolean	Indication of webmail	0
}