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Postfix is a free, open-source mailer that was designed to be an alternative to Sendmail. It is written and maintained by Wietse Venema. Postfix is prone to a denial of service condition. Postfix keeps a log of all client-server SMTP conversations. However, there is no limit placed on how much memory the log may consume. Theoretically, this may result in a denial of service if the SMTP log becomes too large.

Postfix is a free, open-source mailer that was designed to be an alternative to Sendmail. It is written and maintained by Wietse Venema. Postfix is prone to a denial of service condition. Postfix keeps a log of all client-server SMTP conversations. However, there is no limit placed on how much memory the log may consume. Theoretically, this may result in a denial of service if the SMTP log becomes too large.