diff --git a/.travis.yml b/.travis.yml
index 0c0c4639d9a..668ebaabca1 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-osx_image: xcode8
+osx_image: xcode7.3
 
 matrix:
   include:
diff --git a/src/errorMessages.ts b/src/errorMessages.ts
index 98099318dbc..b6ddb5c1978 100644
--- a/src/errorMessages.ts
+++ b/src/errorMessages.ts
@@ -9,7 +9,7 @@ export const buildIsMissed = `Please specify 'build' configuration in the develo
 is required.
 `
 
-export const authorEmailIsMissed = `Please specify author 'email' in the application package.json ('%s')
+export const authorEmailIsMissed = `Please specify author 'email' in the application package.json
 
 See https://docs.npmjs.com/files/package.json#people-fields-author-contributors
 
diff --git a/src/metadata.ts b/src/metadata.ts
index 1e004f6e9a2..29c1b1005a9 100755
--- a/src/metadata.ts
+++ b/src/metadata.ts
@@ -73,7 +73,7 @@ export interface RepositoryInfo {
 
 export interface AuthorMetadata {
   readonly name: string
-  readonly email: string
+  readonly email?: string
 }
 
 export type CompressionLevel = "store" | "normal" | "maximum"
diff --git a/src/packager.ts b/src/packager.ts
index 3b98d818cd2..3f65da5ce33 100644
--- a/src/packager.ts
+++ b/src/packager.ts
@@ -196,9 +196,6 @@ export class Packager implements BuildInfo {
       if (author == null) {
         throw new Error(`Please specify "author" in the application package.json ('${appPackageFile}') — it is used as company name.`)
       }
-      else if (author.email == null && this.options.targets!.has(Platform.LINUX)) {
-        throw new Error(util.format(errorMessages.authorEmailIsMissed, appPackageFile))
-      }
 
       if (build.name != null) {
         throw new Error(util.format(errorMessages.nameInBuildSpecified, appPackageFile))
diff --git a/src/targets/fpm.ts b/src/targets/fpm.ts
index 94fb1e7f9c9..d057ca3ada2 100644
--- a/src/targets/fpm.ts
+++ b/src/targets/fpm.ts
@@ -6,6 +6,7 @@ import { downloadFpm } from "../util/binDownload"
 import {  readFile, outputFile } from "fs-extra-p"
 import { Promise as BluebirdPromise } from "bluebird"
 import { LinuxTargetHelper, installPrefix } from "./LinuxTargetHelper"
+import * as errorMessages from "../errorMessages"
 
 const template = require("lodash.template")
 
@@ -66,7 +67,15 @@ export default class FpmTarget extends TargetEx {
     }
 
     const options = this.options
-    const author = options.maintainer || `${appInfo.metadata.author!.name} <${appInfo.metadata.author!.email}>`
+    let author = options.maintainer
+    if (author == null) {
+      const a = appInfo.metadata.author!
+      if (a.email == null) {
+        throw new Error(errorMessages.authorEmailIsMissed)
+      }
+      author = `${a.name} <${a.email}>`
+    }
+
     const synopsis = options.synopsis
     const args = [
       "-s", "dir",
diff --git a/src/util/util.ts b/src/util/util.ts
index 7131bafbfd8..0835ca20ee6 100644
--- a/src/util/util.ts
+++ b/src/util/util.ts
@@ -68,7 +68,7 @@ export function removePassword(input: string): string {
 
 export function exec(file: string, args?: Array<string> | null, options?: ExecOptions): BluebirdPromise<string> {
   if (debug.enabled) {
-    debug(removePassword(`Executing ${file} ${args == null ? "" : args.join(" ")}`))
+    debug(`Executing ${file} ${args == null ? "" : removePassword(args.join(" "))}`)
   }
 
   return new BluebirdPromise<string>((resolve, reject) => {
@@ -105,7 +105,7 @@ export function doSpawn(command: string, args: Array<string>, options?: SpawnOpt
   }
 
   if (debug.enabled) {
-    debug(`Spawning ${command} ${args.join(" ")}`)
+    debug(`Spawning ${command} ${removePassword(args.join(" "))}`)
   }
   return _spawn(command, args, options)
 }
diff --git a/src/windowsCodeSign.ts b/src/windowsCodeSign.ts
index 3b567321407..3333dcf4f37 100644
--- a/src/windowsCodeSign.ts
+++ b/src/windowsCodeSign.ts
@@ -1,4 +1,4 @@
-import { spawn } from "./util/util"
+import { exec } from "./util/util"
 import { rename } from "fs-extra-p"
 import * as path from "path"
 import { release } from "os"
@@ -104,7 +104,7 @@ async function spawnSign(options: SignOptions, inputPath: string, outputPath: st
     args.push(inputPath)
   }
 
-  return await spawn(await getToolPath(), args)
+  return await exec(await getToolPath(), args)
 }
 
 // async function verify(options: any) {