Buffer overflow in the login functions in IMAP server (imapd) in Ipswitch IMail 5.0 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via (1) a long user name or (2) a long password.
https://exchange.xforce.ibmcloud.com/vulnerabilities/1895
http://marc.info/?l=bugtraq&m=92038879607336&w=2