diff --git a/conf.d/03-e2e-policy.cfg.lua b/conf.d/03-e2e-policy.cfg.lua
index 2b14781..19fab10 100644
--- a/conf.d/03-e2e-policy.cfg.lua
+++ b/conf.d/03-e2e-policy.cfg.lua
@@ -2,7 +2,10 @@ local stringy = require "stringy"
 
 e2e_policy_chat = os.getenv("E2E_POLICY_CHAT") or "required"
 e2e_policy_muc = os.getenv("E2E_POLICY_MUC") or "required"
-e2e_policy_whitelist = stringy.split(os.getenv("E2E_POLICY_WHITELIST"), ", ")
+
+local whitelist = os.getenv("E2E_POLICY_WHITELIST") or ""
+e2e_policy_whitelist = stringy.split(whitelist, ", ")
+
 e2e_policy_message_optional_chat = "For security reasons, OMEMO, OTR or PGP encryption is STRONGLY recommended for conversations on this server."
 e2e_policy_message_required_chat = "For security reasons, OMEMO, OTR or PGP encryption is required for conversations on this server."
 e2e_policy_message_optional_muc = "For security reasons, OMEMO, OTR or PGP encryption is STRONGLY recommended for MUC on this server."
diff --git a/conf.d/04-server_contact_info.cfg.lua b/conf.d/04-server_contact_info.cfg.lua
index 52437e7..971392d 100644
--- a/conf.d/04-server_contact_info.cfg.lua
+++ b/conf.d/04-server_contact_info.cfg.lua
@@ -1,10 +1,18 @@
 local stringy = require "stringy" 
 
+local domain = os.getenv("DOMAIN")
+local abuse = os.getenv("SERVER_CONTACT_INFO_ABUSE") or "xmpp:abuse@" .. domain
+local admin = os.getenv("SERVER_CONTACT_INFO_ADMIN") or "xmpp:admin@" .. domain
+local feedback = os.getenv("SERVER_CONTACT_INFO_FEEDBACK") or "xmpp:feedback@" .. domain
+local sales = os.getenv("SERVER_CONTACT_INFO_SALES") or "xmpp:sales@" .. domain
+local security = os.getenv("SERVER_CONTACT_INFO_SECURITY") or "xmpp:security@" .. domain
+local support = os.getenv("SERVER_CONTACT_INFO_SUPPORT") or "xmpp:support@" .. domain
+
 contact_info = {
-  abuse = stringy.split(os.getenv("SERVER_CONTACT_INFO_ABUSE"), ", ");
-  admin = stringy.split(os.getenv("SERVER_CONTACT_INFO_ADMIN"), ", ");
-  feedback = stringy.split(os.getenv("SERVER_CONTACT_INFO_FEEDBACK"), ", ");
-  sales = stringy.split(os.getenv("SERVER_CONTACT_INFO_SALES"), ", ");
-  security = stringy.split(os.getenv("SERVER_CONTACT_INFO_SECURITY"), ", ");
-  support = stringy.split(os.getenv("SERVER_CONTACT_INFO_SUPPORT"), ", ");
+  abuse = stringy.split(abuse, ", ");
+  admin = stringy.split(admin, ", ");
+  feedback = stringy.split(feedback, ", ");
+  sales = stringy.split(sales, ", ");
+  security = stringy.split(security, ", ");
+  support = stringy.split(support, ", ");
 }
diff --git a/conf.d/05-vhost.cfg.lua b/conf.d/05-vhost.cfg.lua
index e92508f..1f5bcec 100644
--- a/conf.d/05-vhost.cfg.lua
+++ b/conf.d/05-vhost.cfg.lua
@@ -1,8 +1,8 @@
 local domain = os.getenv("DOMAIN")
-local domain_http_upload = os.getenv("DOMAIN_HTTP_UPLOAD")
-local domain_muc = os.getenv("DOMAIN_MUC")
-local domain_proxy = os.getenv("DOMAIN_PROXY")
-local domain_pubsub = os.getenv("DOMAIN_PUBSUB")
+local domain_http_upload = os.getenv("DOMAIN_HTTP_UPLOAD") or "upload." .. domain
+local domain_muc = os.getenv("DOMAIN_MUC") or "conference." .. domain
+local domain_proxy = os.getenv("DOMAIN_PROXY") or "proxy." .. domain
+local domain_pubsub = os.getenv("DOMAIN_PUBSUB") or "pubsub." .. domain
 
 -- XEP-0368: SRV records for XMPP over TLS
 -- https://compliance.conversations.im/test/xep0368/
diff --git a/docker-entrypoint.bash b/docker-entrypoint.bash
index 909b836..3d85187 100755
--- a/docker-entrypoint.bash
+++ b/docker-entrypoint.bash
@@ -1,19 +1,6 @@
 #!/bin/bash
 set -e
 
-export DOMAIN_HTTP_UPLOAD=${DOMAIN_HTTP_UPLOAD:-"upload.$DOMAIN"}
-export DOMAIN_MUC=${DOMAIN_MUC:-"conference.$DOMAIN"}
-export DOMAIN_PROXY=${DOMAIN_PROXY:-"proxy.$DOMAIN"}
-export DOMAIN_PUBSUB=${DOMAIN_PUBSUB:-"pubsub.$DOMAIN"}
-export E2E_POLICY_WHITELIST=${E2E_POLICY_WHITELIST:-""}
-export SERVER_CONTACT_INFO_ABUSE=${SERVER_CONTACT_INFO_ABUSE:-"xmpp:abuse@$DOMAIN"}
-export SERVER_CONTACT_INFO_ADMIN=${SERVER_CONTACT_INFO_ADMIN:-"xmpp:admin@$DOMAIN"}
-export SERVER_CONTACT_INFO_FEEDBACK=${SERVER_CONTACT_INFO_FEEDBACK:-"xmpp:feedback@$DOMAIN"}
-export SERVER_CONTACT_INFO_SALES=${SERVER_CONTACT_INFO_SALES:-"xmpp:sales@$DOMAIN"}
-export SERVER_CONTACT_INFO_SECURITY=${SERVER_CONTACT_INFO_SECURITY:-"xmpp:security@$DOMAIN"}
-export SERVER_CONTACT_INFO_SUPPORT=${SERVER_CONTACT_INFO_SUPPORT:-"xmpp:support@$DOMAIN"}
-export PROSODY_ADMINS=${PROSODY_ADMINS:-""}
-
 if [[ "$1" != "prosody" ]]; then
     exec prosodyctl $*
     exit 0;
diff --git a/prosody.cfg.lua b/prosody.cfg.lua
index 9f7ebd4..b53faeb 100644
--- a/prosody.cfg.lua
+++ b/prosody.cfg.lua
@@ -3,7 +3,8 @@
 
 local stringy = require "stringy" 
 
-admins = stringy.split(os.getenv("PROSODY_ADMINS"), ", ");
+local prosody_admins = os.getenv("PROSODY_ADMINS") or "";
+admins = stringy.split(prosody_admins, ", ");
 
 pidfile = "/var/run/prosody/prosody.pid"