Don't use generic maps.

In fact we want to only rewrite the envelope sender:

    :/etc/postfix/main.cf
    # Overwrite local FQDN envelope sender addresses
    sender_canonical_classes       = envelope_sender
    propagate_unmatched_extensions =
    sender_canonical_maps          = cdb:$config_directory/sender_canonical

    :/etc/postfix/sender_canonical
    @elefant.fripost.org     admin@fripost.org

However, when canonical(5) processes a mail sent vias sendmail(1), it
rewrites the envelope sender which seems to *later* be use as From:
header.

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