Switched to msmtp

ssmtp is not available in buster, so we wouldn't be able to send mails.
Switched to msmtp, which serves the same purpose.

Dockerfile

@@ -5,7 +5,7 @@ RUN set -ex; \
 	apt-get update; \
 	\
 	apt-get install -y --no-install-recommends \
-		ssmtp \
+		msmtp \
 	; \
 	\
 	rm -rf /var/lib/apt/lists/* ;\

build-rootfs.sh

@@ -3,6 +3,7 @@
 set -ex
 
 # Configuration options you usually edit go here
+CONTAINER_MSMTPCONFDIR=/etc
 CONTAINER_SSMTPCONFDIR=/etc/ssmtp
 CONTAINER_PHP_CONFD=/usr/local/etc/php/conf.d
 
@@ -14,6 +15,7 @@ BUILDDIR=$(pwd)/build
 SCRIPTS_SRC=${SRCDIR}/scripts
 ROOTFSTREE=${TMPDIR}/tree
 ROOTFSFILE=${BUILDDIR}/rootfs.tar.gz
+MSMTPRC_DST=${ROOTFSTREE}${CONTAINER_MSMTPCONFDIR}
 SSMTPCONF_DST=${ROOTFSTREE}${CONTAINER_SSMTPCONFDIR}
 PHP_CONFD_DST=${ROOTFSTREE}${CONTAINER_PHP_CONFD}
 
@@ -31,8 +33,12 @@ mkdir ${BUILDDIR}
 #### Do the work.
 
 # Create SSMTP config file
-mkdir -p ${SSMTPCONF_DST}
+#mkdir -p ${SSMTPCONF_DST}
-cp ${SRCDIR}/ssmtp.conf ${SSMTPCONF_DST}/ssmtp.conf
+#cp ${SRCDIR}/ssmtp.conf ${SSMTPCONF_DST}/ssmtp.conf
+
+# Create MSMTP config file (SSMTP is currently unavailble in Debian Buster)
+mkdir -p ${MSMTPRC_DST}
+cp ${SRCDIR}/msmtprc ${MSMTPRC_DST}/msmtprc
 
 # Setup PHP
 mkdir -p ${PHP_CONFD_DST}

src/mail.ini

@@ -1 +1 @@
-sendmail_path = "/usr/sbin/ssmtp -t -i"
+sendmail_path = "/usr/bin/msmtp -t"

src/msmtprc

@@ -0,0 +1,10 @@
+account default
+
+host nathan.nehmer.net
+tls on
+tls_starttls on
+domain docker.nehmer.net
+
+from postmaster@nehmer.net
+maildomain nehmer.net
+