#! /bin/zsh
#
# this file:
#   http://user.it.uu.se/~embe8573/conf/.zsh/mail
#   https://dataswamp.org/~incal/conf/.zsh/mail
#
# the DMARC issue:
#   https://en.wikipedia.org/wiki/DMARC
#   https://mailarchive.ietf.org/arch/msg/ietf/kL24edUthAOuHuwK3ZnpFkCXduI
#
# RFC 7489:
#   "Domain-based Message Authentication,
#    Reporting, and Conformance (DMARC)"
#    <https://tools.ietf.org/html/rfc7489>
#
# discussion and commands:
#   http://lists.gnu.org/archive/html/help-gnu-emacs/2019-05/msg00476.html
#   http://lists.gnu.org/archive/html/help-gnu-emacs/2019-05/msg00477.html
#   http://lists.gnu.org/archive/html/help-gnu-emacs/2019-05/msg00481.html

export DMARK_ZOHO=_dmarc.zoho.eu
dig-zoho () {
    dig $DMARK_ZOHO txt +short
}

host-zoho () {
    host -t txt $DMARK_ZOHO
}

test-zoho () {
    local server=pop.zoho.com
    local port=995

    echo "socat"
    socat - OPENSSL:${server}:${port}

    echo "\nopenssl"
    openssl s_client -quiet -connect ${server}:${port}

    echo "\ngutls-cli"
    gnutls-cli --port $port $server
}