sendmail 8.9.3

This version includes a new option, MaxHeadersLength, that limits the length of the sum of all header lines in any given message, which can prevent a denial-of-service attack. Also included is a new version of mail.local that implements the Local Mail Transfer Protocol, RFC 2033. This change allows for re-queuing of mail to the recipients that did not receive a message, rather than re-sending the message to all of the recipients if an error occurs. A new file called /etc/default/sendmail can be used to store options to start sendmail, so that the options are not touched during an upgrade. In addition, a new utility called smrsh increases security by reducing the number of commands that can be run using the |program syntax of sendmail.

For more information, see the System Administration Guide, Volume 3.