diff --git a/setup/install.sh b/setup/install.sh
index 62a58c03..806d820c 100755
--- a/setup/install.sh
+++ b/setup/install.sh
@@ -452,7 +452,7 @@ mkdir -p /opt/wildduck-webmail
 git --git-dir=/var/opt/wildduck-webmail.git --work-tree=/opt/wildduck-webmail checkout "$WEBMAIL_COMMIT"
 cp /opt/wildduck-webmail/config/default.toml /etc/wildduck/wildduck-webmail.toml
 
-sed -i -e "s/localhost/$HOSTNAME/g;s/999/99/g;s/2587/587/g" /etc/wildduck/wildduck-webmail.toml
+sed -i -e "s/localhost/$HOSTNAME/g;s/999/99/g;s/2587/587/g;s/proxy=false/proxy=true/g" /etc/wildduck/wildduck-webmail.toml
 
 cd /opt/wildduck-webmail
 npm install --unsafe-perm --production