diff --git a/Dockerfile b/Dockerfile
index cb200a9..a80a4c0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ FROM wordpress:4.9.2-fpm
 RUN apt-get update \
 	&& apt-get install -y openssh-server ssmtp \
 	&& useradd -c "Hosting Admin User" -u 1000 -g users -G www-data -d /var/www/html -M lamp \
-	&& sed -i -e 's/^mailhub=mail$/mailhub=smtp/' -e "s/${HOSTNAME}//" /etc/ssmtp/ssmtp.conf
+	&& sed -i -e 's/^mailhub=mail$/mailhub=smtp/' -e "s/^hostname=/#hostname=/" -e 's/#FromLineOverride=YES/FromLineOverride=YES/' /etc/ssmtp/ssmtp.conf
 
 COPY sshd_config.patch /tmp
 RUN (cd / && patch -p0 ) < /tmp/sshd_config.patch && rm /tmp/sshd_config.patch