fix tar cmd line

mail.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Mail via GMX-Relay versenden (Podman-Image "smtp-relay")
+# Mail via Proton-Relay versenden (Podman-Image "smtp-relay")
 #
 # Klappt nur direkt im Container, daher ggf. via ssh aufrufen (Annahme: remote user == local user)
 #
@@ -64,7 +64,7 @@ CONTENT=$(cat ${1:--})
 MAILCMD="$PODMANCMD exec -i $MAILCONTAINER /usr/sbin/sendmail -i -t"
 # construct mail header + content and pipe to sendmail
 cat <<EOMB | $MAILCMD
-FROM: hb42@gmx.de
+FROM: server@keinekekse.net
 TO: ${TO}
 DATE: $(date -R)
 MIME-Version: 1.0