From fe0f32165490194be43e6de4f9799376d687bd1b Mon Sep 17 00:00:00 2001
From: Gogs <gogitservice@gmail.com>
Date: Thu, 19 Feb 2015 02:10:30 +0300
Subject: [PATCH] Fix: "504 5.5.2 <localhost>: Helo command rejected: need
 fully-qualified hostname"

---
 modules/mailer/mailer.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/modules/mailer/mailer.go b/modules/mailer/mailer.go
index 6a23e5d09..57400e73f 100644
--- a/modules/mailer/mailer.go
+++ b/modules/mailer/mailer.go
@@ -10,6 +10,7 @@ import (
 	"net"
 	"net/mail"
 	"net/smtp"
+	"os"
 	"strings"
 
 	"github.com/gogits/gogs/modules/log"
@@ -95,6 +96,12 @@ func sendMail(settings *setting.Mailer, recipients []string, msgContent []byte)
 		return err
 	}
 
+	hostname, err := os.Hostname()
+	if err != nil {
+		return err
+	}
+	client.Hello(hostname)
+
 	// If not using SMTPS, alway use STARTTLS if available
 	hasStartTLS, _ := client.Extension("STARTTLS")
 	if !isSecureConn && hasStartTLS {