Outgoing email proxying

src/freedombone-base-email

@@ -1008,6 +1008,46 @@ function install_email_basic {
     systemctl restart exim4
 }
 
+function email_smtp_proxy_through_isp {
+    isp_smtp_domain="$1"
+    isp_smtp_port="$2"
+    isp_smtp_username="$3"
+    isp_smtp_password="$4"
+
+    if [[ "$isp_smtp_domain" == 'off' || "$isp_smtp_domain" == '0' || "$isp_smtp_domain" == '' ]]; then
+        { echo '# password file used when the local exim is authenticating to a remote';
+          echo '# host as a client.';
+          echo '#';
+          echo '# see exim4_passwd_client(5) for more documentation';
+          echo '#';
+          echo '# Example:';
+          echo '### target.mail.server.example:login:password'; } > /etc/exim4/passwd.client
+        sed -i "s|dc_smarthost=.*|dc_smarthost=''|g" /etc/exim4/update-exim4.conf.conf
+    else
+        if [[ "$isp_smtp_domain" != *'.'* ]]; then
+            return
+        fi
+        if [ ! "$isp_smtp_port" ]; then
+            isp_smtp_port=465
+        fi
+        if [ "$isp_smtp_username" ]; then
+            if [ "$isp_smtp_password" ]; then
+                { echo '# password file used when the local exim is authenticating to a remote';
+                  echo '# host as a client.';
+                  echo '#';
+                  echo '# see exim4_passwd_client(5) for more documentation';
+                  echo '#';
+                  echo "${isp_smtp_username}:${isp_smtp_password}"; } > /etc/exim4/passwd.client
+            fi
+        fi
+        sed -i "s|dc_smarthost=.*|dc_smarthost='${isp_smtp_domain}::${isp_smtp_port}'|g" /etc/exim4/update-exim4.conf.conf
+    fi
+
+    update-exim4.conf
+    dpkg-reconfigure --frontend noninteractive exim4-config
+    systemctl restart exim4
+}
+
 function email_change_relay {
     curr_ip_address="$1"
     email_relay_base=$(echo "$curr_ip_address" | awk -F '.' '{print $1"."$2"."$3}')

src/freedombone-installer

@@ -32,6 +32,9 @@ PROJECT_NAME='freedombone'
 export TEXTDOMAIN=${PROJECT_NAME}-installer
 export TEXTDOMAINDIR="/usr/share/locale"
 
+# for outgoing smtp relay
+source "/usr/share/${PROJECT_NAME}/base/${PROJECT_NAME}-base-email"
+
 SSH_PORT=2222
 
 INSTALL_STATE_FIRST_BOOT=0
@@ -66,6 +69,7 @@ FIREWALL_DOMAINS=/root/${PROJECT_NAME}-firewall-domains.cfg
 local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
 
 webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
+email_proxy_file="$webadmin_install_dir/.emailproxy.txt"
 theme_file="$webadmin_install_dir/.theme.txt"
 translations_import_file="$webadmin_install_dir/.translations_import.txt"
 icecast_file="$webadmin_install_dir/.icecast.txt"
@@ -2494,6 +2498,20 @@ function update_bridges {
     fi
 }
 
+function update_email_proxy {
+    # This allows outgoing email to be proxied through your ISP or another SMTP server
+    if [ -f "$email_proxy_file" ]; then
+        isp_smtp_domain=$(awk -F ',' '{print $1}' < "$email_proxy_file")
+        isp_smtp_port=$(awk -F ',' '{print $2}' < "$email_proxy_file")
+        isp_smtp_username=$(awk -F ',' '{print $3}' < "$email_proxy_file")
+        isp_smtp_password=$(awk -F ',' '{print $4}' < "$email_proxy_file")
+
+        rm "$email_proxy_file"
+
+        email_smtp_proxy_through_isp "$isp_smtp_domain" "$isp_smtp_port" "$isp_smtp_username" "$isp_smtp_password"
+    fi
+}
+
 function update_dynamic_dns {
     if [ -f "$dynamic_dns_file" ]; then
         ddns=$(awk -F ',' '{print $1}' < "$dynamic_dns_file")
@@ -2833,6 +2851,7 @@ do
                     update_smolrss
                     update_icecast
                     update_dat_links
+                    update_email_proxy
                     import_translations
                     webadmin_upgrade
                     install_apps_from_webadmin