-courier-mta, esmtp-run, hula-mta, masqmail, mta-dummy, nullmailer, postfix, sendmail-bin, smail, ssmtp, xmail, zmailer
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+citadel-server, courier-mta, dma, esmtp-run, hula-mta, masqmail, msmtp-mta, mta-dummy, nullmailer, opensmtpd, postfix, qmail-run, sendmail-bin, smail, ssmtp, xmail, zmailer