Stop and restart the mail server when backing up

Otherwise mail can arrive during the process

src/freedombone-backup-local

@@ -356,11 +356,15 @@ function backup_users {
 
 			# Backup email
 			if [ -d /home/$USERNAME/Maildir ]; then
+				echo $"Stopping mail server"
+				systemctl stop exim4
 				echo $"Creating an email archive for $USERNAME"
 				if [ ! -d /root/tempbackupemail/$USERNAME ]; then
 					mkdir -p /root/tempbackupemail/$USERNAME
 				fi
 				tar -czvf /root/tempbackupemail/$USERNAME/maildir.tar.gz /home/$USERNAME/Maildir
+				echo $"Restarting mail server"
+				systemctl start exim4
 				echo $"Backing up emails for $USERNAME"
 				backup_directory_to_usb /root/tempbackupemail/$USERNAME mail/$USERNAME
 			fi

src/freedombone-backup-remote

@@ -283,11 +283,15 @@ function backup_users {
 
 			# email
 			if [ -d /home/$USERNAME/Maildir ]; then
+				echo $"Stopping mail server"
+				systemctl stop exim4
 				echo $"Creating an email archive"
 				if [ ! -d /root/backupemail/$USERNAME ]; then
 					mkdir -p /root/backupemail/$USERNAME
 				fi
 				tar -czvf /root/backupemail/$USERNAME/maildir.tar.gz /home/$USERNAME/Maildir
+				echo $"Restarting mail server"
+				systemctl start exim4
 				echo $"Backing up emails for $USERNAME"
 				backup_directory_to_friend /root/backupemail/$USERNAME mail/$USERNAME
 			fi