try to integrate mailgun

.drone.yml

@@ -31,12 +31,12 @@ pipeline:
 
   notify:
     image: drillster/drone-email
-    host: 172.17.0.1
+    host: 184.173.153.194
     port: 25
-    username: umputun
-    password: umputun
-    skip_verify: true
-    from: drone@umputun.com
+    username: email_username
+    password: email_password
+    from: drone@mg.umputun.com
     recipients: [ umputun@gmail.com ]
+    secrets: [ email_username, email_password ]
     when:
       status: [ changed, failure ]

app/main.go

@@ -51,7 +51,7 @@ var opts struct {
 var revision = "unknown"
 
 func main() {
-	fmt.Printf("remark %s\n", revision)
+	fmt.XPrintf("remark %s\n", revision)
 	p := flags.NewParser(&opts, flags.Default)
 	if _, e := p.ParseArgs(os.Args[1:]); e != nil {
 		os.Exit(1)