add required date header

main.go

@@ -7,13 +7,13 @@ import (
 	"encoding/base32"
 	"encoding/json"
 	"fmt"
+	"github.com/jmoiron/sqlx"
+	"golang.org/x/crypto/bcrypt"
 	"html/template"
 	"log"
 	"net/smtp"
 	"strings"
-
-	"github.com/jmoiron/sqlx"
-	"golang.org/x/crypto/bcrypt"
+	"time"
 )
 
 type templates struct {
@@ -467,10 +467,12 @@ func SendMail(addr, from, subject, body string, to string) error {
 		return err
 	}
 
+	date := time.Now()
 	msg := "To: " + to + "\r\n" +
 		"From: " + from + "\r\n" +
 		"Subject: " + subject + "\r\n" +
 		"Content-Type: text/html; charset=\"UTF-8\"\r\n" +
+		"Date: " + date.Format(time.RFC1123Z) + "\r\n" +
 		"\r\n" + body
 
 	_, err = w.Write([]byte(msg))