problems sending to the list

Matthias Apitz guru at
Sun Feb 11 09:29:58 CET 2018


Sometimes I do SSH into my server of my ISP and send email to the list
from there. This always failes with the message below.

Can some list admin please check, why? Thanks


----- Forwarded message from Mail Delivery System <Mailer-Daemon at> -----

Date: Fri, 09 Feb 2018 11:14:13 +0100
From: Mail Delivery System <Mailer-Daemon at>
To: ftp51246-2575596 at
Subject: Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  gnupg-users at
    host []
    SMTP error from remote mail server after RCPT TO:<gnupg-users at>:
    451 Could not complete sender verify callout:
    retry timeout exceeded

Reporting-MTA: dns;

Action: failed
Final-Recipient: rfc822;gnupg-users at
Status: 5.0.0
Remote-MTA: dns;
Diagnostic-Code: smtp; 451 Could not complete sender verify callout: retry timeout exceeded

Date: Mon, 5 Feb 2018 11:12:12 +0100
From: Matthias Apitz <guru at>
To: gnupg-users at
Subject: OpenPGP card && exporting secret keys


I'm using an OpenPGP card and gnupg 2.1.19 on my FreeBSD workstations
and my Ubuntu mobile device to store crypted passwords (tool: password-store),
to lock/unlock desktop sessions and to sign emails. This is all working
fine and without any hick-ups.

What makes me worry, is that single point of failure: the OpenPGP card.

While I do backups of alls the encrypted password files, they would be
all useless in case of lost/teft of the token or hardware fault of the SIM

What I do at the moment is something like:

$ find ~/.password-store -name '*.gpg' -exec printf "%s:\n" {} \;
  -and -exec gpg2 -d {} 2> /dev/null \; 
  -and -exec echo \; > /tmp/clear-password-store.txt

$ gpg -ea /tmp/clear-password-store.txt
$ mv /tmp/clear-password-store.txt.asc $GNUPGHOME
$ rm -P /tmp/clear-password-store.txt

where the other GNUPGHOME contains secret and pub-keys created for this
special purpose and living outside (i.e. without) the OpenPGP card.
ANd in case of lost/teft of the token I could recover at least all
passwords again...

Is there any way to export the secret keys from the OpenPGP card to use
them directly (with a passphrase) and without the OpenPGP card?



----- End forwarded message -----

Matthias Apitz, ✉ guru at, ⌂  📱 +49-176-38902045
Public GnuPG key:

Thanks to the Soviet Army for the Victory in Stalingrad! -- Победа в Сталинградской битве!
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