Download: http://www.courier-mta.org/download.php
Common changes:• Workaround for invalid UTF-8 input problem to libidn, might be the cause of random IMAP and webmail server bugs and crashes.
Other changes in the Courier package:• Support for DNS-based blacklists expanded to include DNS-based whitelists, updating semantics of the existing -block option to couriertcpd, and adding - allow option.
• Added DNS blacklist/whitelist support for IPv6 addresses.• Add support for SMTPS (encrypted SMTP over port 465) to the ESMTP client (smarthost).
• couriermlm: when receiving moderator messages, MIME decode them before attempting to parse the moderator's command. • Fixed minor bugs in error reporting, should get rid of spurious "No such file or directory" messages in mail logs.• Changed error handling when sending mail to mail servers that advertise that they can support encrypted SMTP, but fail to open an encrypted connection once Courier takes up their offer. Removed the /SECURITY=NONE option from esmtproutes. When sending mail to a server that advertises STARTTLS, but either subsequently rejects the STARTTLS request with an error message, or by dropping the connection, the mail is requeued, and the server's name is logged. Subsequent connection attempts to the same server, to resend this message or send any other message, will ignore the server's STARTTLS capability. This is logged in a rotating log file, that's erased after 2-4 hours, at which time the next connection attempt will once again attempt to use STARTTLS, and see what happens.
* /SECURITY=REQUIRED replaces /SECURITY=NONE. If set, in esmtproutes, mail will not be sent to this mail server, without STARTTLS. Note, though, that this doesn't mean much, unless ESMTP_TLS_VERIFY_DOMAIN is set to 1 in courierd (together with the additional variables that are documented there), which will require remote mail servers to use valid certificates signed by a trusted CA root.
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