Vulnerability in Postfix SMTP server before 20010228-pl07, when configured to email the postmaster when SMTP errors cause the session to terminate, allows remote attackers to cause a denial of service (memory exhaustion) by generating a large number of SMTP errors, which forces the SMTP session log to grow too large.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7568
http://www.securityfocus.com/bid/3544
http://www.redhat.com/support/errata/RHSA-2001-156.html
http://www.debian.org/security/2001/dsa-093
http://marc.info/?l=bugtraq&m=100584160110303&w=2
http://frontal2.mandriva.com/security/advisories?name=MDKSA-2001:089
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000439