NAME

       email-extract-openpgp-certs - extract OpenPGP certificates from an e-mail

SYNOPSIS

       email-extract-openpgp-certs <message.eml | gpg --import

DESCRIPTION

       email-extract-openpgp-certs extracts all the things it can find that look like they might be OpenPGP
       certificates in an e-mail, and produces them on standard output.

       It currently knows about how to find OpenPGP certificates as attachments of MIME type
       application/pgp-keys, and Autocrypt: style headers.

OPTIONS

       None.

EXAMPLE

           $ notmuch show --format-raw id:b7e48905-842f@example.net >test.eml
           $ email-extract-openpgp-certs <test.eml | gpg --import

LIMITATIONS

       email-extract-openpgp-certs currently does not try to decrypt encrypted e-mails, so it cannot find
       certificates that are inside the message's cryptographic envelope.

       email-extract-openpgp-certs does not attempt to validate the certificates it finds in any way.  It does
       not ensure that they are valid OpenPGP certificates, or even that they are of a sane size. It does not
       try to establish any relationship between the extracted certificates and the messages in which they are
       sent.  For example, it does not check the Autocrypt addr= attribute against the message's From: header.

       Importing certificates extracted from an arbitrary e-mail in this way into a curated keyring is not a
       good idea.  Better to extract into an ephemeral location, inspect, filter, and then selectively import.

SEE ALSO

       gpg(1), https://autocrypt.org, https://tools.ietf.org/html/rfc4880, https://tools.ietf.org/html/rfc3156

AUTHOR

       email-extract-openpgp-certs and this manpage were written by Daniel Kahn Gillmor, with guidance and
       advice from many others.