diff --git a/app.json b/app.json
index 5faa23bc2..a2e75404b 100644
--- a/app.json
+++ b/app.json
@@ -14,8 +14,7 @@
             "required": true
         },
         "NODE_ENV": "production",
-        "TALK_SMTP_PORT": "2525",
-        "REWRITE_ENV": "TALK_PORT:PORT,TALK_MONGO_URL:MONGO_URI,TALK_REDIS_URL:REDIS_URL,TALK_SMTP_HOST:POSTMARK_SMTP_SERVER,TALK_SMTP_USERNAME:POSTMARK_API_TOKEN,TALK_SMTP_PASSWORD:POSTMARK_API_TOKEN",
+        "REWRITE_ENV": "TALK_PORT:PORT,TALK_MONGO_URL:MONGO_URI,TALK_REDIS_URL:REDIS_URL,TALK_SMTP_HOST:MAILGUN_SMTP_SERVER,TALK_SMTP_PORT:MAILGUN_SMTP_PORT,TALK_SMTP_USERNAME:MAILGUN_SMTP_LOGIN,TALK_SMTP_PASSWORD:MAILGUN_SMTP_PASSWORD",
         "NPM_CONFIG_PRODUCTION": "false"
     },
     "addons": [{
@@ -25,8 +24,8 @@
         "plan": "rediscloud:30",
         "as": "REDIS"
     }, {
-        "plan": "postmark:10k",
-        "as": "POSTMARK"
+        "plan": "mailgun:starter",
+        "as": "MAILGUN"
     }],
     "image": "heroku/nodejs",
     "success_url": "/admin/install"