Multiple buffer overflows in E-Post Mail Server 4.10 and SPA-PRO Mail @Solomon 4.00 allow remote attackers to execute arbitrary code via a long username to the (1) AUTH PLAIN or (2) AUTH LOGIN SMTP commands, which is not properly handled by (a) EPSTRS.EXE or (b) SPA-RS.EXE; (3) a long username in the APOP POP3 command, which is not properly handled by (c) EPSTPOP4S.EXE or (d) SPA-POP3S.EXE; (4) a long IMAP DELETE command, which is not properly handled by (e) EPSTIMAP4S.EXE or (f) SPA-IMAP4S.EXE.

Hitachi Groupmax Mail SMTP 06-50 through 06-52-/A and 07-00 through 07-20 allows remote attackers to cause a denial of service (service stop) via an e-mail message with an "invalid format."

Free SMTP Server 2.2 allows remote attackers to use the server as an open mail relay (spam proxy).

Format string vulnerability in util.c in nbsmtp 0.99 and earlier, while running in debug mode, allows remote attackers to execute arbitrary code via format string specifiers that are not properly handled in a syslog call.

Multiple stack-based buffer overflows in GoodTech SMTP server 5.16 allow remote attackers to execute arbitrary code via (1) a RCPT TO command with a long DNS name, or (2) a large number of RCPT TO commands with a long e-mail name arugment in the last command.

GoodTech SMTP Server 5.14 allows remote attackers to cause a denial of service (application crash) via a RCPT TO command with an invalid argument, as demonstrated using an "A" character.

bsmtpd 2.3 and earlier does not properly sanitize e-mail addresses, which allows remote attackers to execute arbitrary commands.

Buffer overflow in qwik-smtpd allows remote attackers to use the server as an SMTP spam relay via a long HELO command, which overwrites the adjacent localIP data buffer.

Clearswift MIMEsweeper 5.0.5, when it has been upgraded from MAILsweeper for SMTP version 4.3 or MAILsweeper Business Suite I or II, allows remote attackers to bypass scanning by including encrypted data in a mail message, which causes the message to be marked as "Clean" instead of "Encrypted".

Format string vulnerability in qwik-smtpd.c in QwikMail SMTP (qwik-smtpd) 0.3 and earlier allows remote attackers to execute arbitrary code via format specifiers in the (1) clientRcptTo array, and the (2) Received and (3) messageID variables, possibly involving HELO and hostname arguments.