Single quotes

src/freedombone-base-email

     sed -i 's|pam_mail.so standard noenv|pam_mail.so dir=~/Maildir standard|g' /etc/pam.d/sshd
     sed -i 's|pam_mail.so nopen|pam_mail.so dir=~/Maildir nopen|g' /etc/pam.d/su
 
-    echo 'dc_eximconfig_configtype="internet"' > /etc/exim4/update-exim4.conf.conf
+    echo "dc_eximconfig_configtype='internet'" > /etc/exim4/update-exim4.conf.conf
     if [[ $ONION_ONLY == "no" ]]; then
         # both ICANN and onion domains
         echo "dc_other_hostnames='${DEFAULT_DOMAIN_NAME};${EMAIL_ONION_HOSTNAME}'" >> /etc/exim4/update-exim4.conf.conf