The latest version of these mail servers can be downloaded from Softpedia
Postfix, a mail server that started life at IBM research as an alternative to the widely-used Sendmail program, is now at version 2.10.1.Highlights of Postfix 2.10.1:
• The down-stream maintainers no longer fails to install the new smtpd_relay_restrictions safety net;
• The TCP connections are no longer used when the smtp_tls_policy_maps is specified. According to the developers, TLS policies may depend on the remote destination;
• The trivial-rewrite resolver no longer logs "do not list in both mydestination and " when myhostname hasn't been listed in mydestination;
• TCP connections are no longer used when the SASL authentication has been enabled. SASL passwords depend on the remote SMTP server hostname.
Check out the official announcement for a complete list of fixes and improvements, that are also part of Postfix 2.11.
Download Postfix 2.10.1 right now from Softpedia.