[mail-server] Uses built-in subprocess.DEVNULL instead of opening dev/null

main.py

@@ -9,7 +9,7 @@ from jinja2 import Environment, FileSystemLoader
 import requests
 import base64
 import json
-from subprocess import call
+from subprocess import call, DEVNULL
 import os
 import sys
 
@@ -61,8 +61,8 @@ def generate(api_client):
     fichier.write(virtuals_rendered)
     fichier.close()
 
-    call(["/usr/bin/newaliases"], stdout=open(os.devnull, 'wb')) #  Update the aliases config file
-    call(["/usr/sbin/postmap", path+"/generated/virtual"], stdout=open(os.devnull, 'wb')) #  Update the aliases config file
+    call(["/usr/bin/newaliases"], stdout=DEVNULL) #  Update the aliases config file
+    call(["/usr/sbin/postmap", path+"/generated/virtual"], stdout=DEVNULL) #  Update the aliases config file
     call(["/usr/sbin/postfix", "reload"]) #  force the reloading now
 
 for arg in sys.argv: