# E-MailRelay Change Log

## 2.5 -> 2.5.1

- Filters can control the SMTP server's error response code.
- Proxying with --immediate passes back SMTP reponses more faithfully.
- The --disable-admin build-time configure option is restored.
- New smtp disable admin command to disable new SMTP sessions.
- Fewer Windows handles inherited by filter programs [bug-id #55].
- Fix for --dnsbl option parsing.

## 2.4 -> 2.5

- Multiple configurations in one process.
- SMTP PIPELINING (RFC-2920).
- SMTP CHUNKING/8BITMIME 'BDAT' extension (RFC-3030), disabled by default.
- SMTP SMTPUTF8 extension (RFC-6531), disabled by default.
- No 7-bit/8-bit check on received message content (see NEWS file).
- New built-in filters: deliver:, split:, copy:, mx:, msgid:.
- New built-in address verifier: account:
- No .local files (see NEWS file).
- PAM authentication is now enabled with --server-auth=pam: not /pam.
- Client authentication details can be given directly from the command-line.
- Multiple client authentication secrets, selected by a new envelope field.
- Main binary can act as a simple submission tool (configure --enable-submission).

## 2.3 -> 2.4

- Multiple --filter and --client-filter options allowed.
- TLS key and certificate files can be specified separately.
- Finer control when using --anonymous (eg. --anonymous=server).
- The auth-config options can distinguish between TLS and non-TLS authentication.
- Hourly log file rotation using %h (eg. --log-file=log.%d.%h).
- Listening file descriptors can be inherited from the parent process (see --interface).
- Listening ports on Windows use exclusive binding.
- The Linux event loop uses epoll by default rather than select.
- Some support for message routing (see NEWS).
- Fix of error handling in network client filters (--client-filter=net:...) [bug-id #50].

## 2.2 -> 2.3

- Unix domain sockets supported (eg. --interface=/tmp/smtp.s).
- Windows event log not used for verbose logging (prefer --log-file).
- New admin forward command to trigger forwarding without waiting.
- Optional base64 encoding of passwords in secrets files (plain:b).
- Support for MbedTLS version 3.

## 2.1 -> 2.2

- Connections from IPv4 'private use' addresses are allowed by default (see --remote-clients).
- Interface names can be used with --interface (eg. --interface=eth0).
- New --server-tls-connection option for server-side implicit TLS.
- New --forward-to-some option to permit some message recipients to be rejected.
- New --log-address option to aid adaptive firewalling.
- Dynamic log file rolling when using --log-file=%d.
- Choice of syslog 'facility' on Linux with --syslog=local0 etc.
- Pipelined SMTP QUIT commands sent by broken clients are tolerated.
- Better handling of overly-verbose or unkillable --filter scripts.
- Optional epoll event loop on Linux (configure --enable-epoll).
- Some internationalisation support (see NEWS file).
- Support for Windows XP restored when built with mingw-w64.
- C++ 2011 compiler is required.

## 2.0.1 -> 2.1

- Backwards compatibility features for 1.9-to-2.0 transition removed.
- Better handling of too-many-connections on Windows.
- New --idle-timeout option for server-side connections.
- Support for RFC-5782 DNSBL blocking (--dnsbl).
- Filter scripts are given the path of the envelope file in argv2.
- Message files can be edited by --client-filter scripts.
- Better support for CRAM-SHAx authentication.
- New --client-auth-config and --server-auth-config options.
- New --show option on windows to better control the user interface style.
- The --pop option always requires --pop-auth.
- No message is spooled if all its envelope recipients are local-mailboxes.
- TLS cipher name added to Received line as per RFC-8314 4.3.
- Certificate contents are not logged.
- Timestamp parts of spool filenames no longer limited to six digits.

## 2.0 -> 2.0.1

- Make PLAIN client authentication work against servers with broken 334 responses.

## 1.9.2 -> 2.0

- Improved IPv6 support, with IPv4 and IPv6 used independently at run-time (see --interface).
- Server process is not blocked during --filter or --address-verifier execution, if multi-threaded.
- Support for the mbedTLS TLS library as an alternative to OpenSSL (configure --with-mbedtls).
- TLS server certificates specified with new --server-tls-certificate option, not --server-tls.
- TLS servers enable client certificate verification with --server-tls-verify, not --tls-config.
- TLS clients can verify server certificates with --client-tls-verify and --client-tls-verify-name.
- The --tls-config option works differently (see NEWS file).
- New --client-tls-server-name option for server name identification (SNI).
- New --client-tls-required option to force client connections to use TLS.
- New --server-tls-required option to force remote SMTP clients to use STARTTLS.
- New --forward-on-disconnect option replaces --poll=0.
- The --anonymous option now suppresses the Received line, whatever the --domain.
- The second field in the secrets file indicates the password encoding, not AUTH mechanism.
- The --verifier option is now --address-verifier, with simplified command-line parameters.
- Command-line file paths can use @app as a prefix to be relative to the executable directory.
- Command-line file paths can be relative to the startup cwd even when daemonised.
- Filter exit codes between 104 and 107 are interpreted differently (see NEWS file).
- Message rejection reasons passed back to the submitting SMTP client are much less verbose.
- Forwarding events are queued up if the forwarding client is still busy from last time.
- The bind address for outgoing connections is no longer taken from first unqualified --interface address [bug-id #27].
- The SMTP client protocol tries more than one authentication mechanism.
- Some support for XOAUTH2 client-side authentication.
- Client protocol sends QUIT with a socket shutdown().
- The Windows commdlg list-view widget is used for the server status pages.
- The Windows connection-lookup feature is withdrawn (--peer-lookup).
- Several build-time configure options like --disable-pop are withdrawn.
- C++ 2011 is preferred, and required for multi-threading.
- Support for very old versions of Windows is dropped.

## 1.9.1 -> 1.9.2

- Fixed a leak in the event-loop garbage collection.
- A local hostname that fails to resolve is not an error.
- A warning is emitted if there is more than one client authentication secret.
- Multiple --interface options are allowed separately on the command-line.
- Added a new --client-interface option.
- The Received line is formatted as per RFC-3848 (with ESMTPSA).
- The LOGIN and PLAIN mechanisms in the secrets file are now equivalent.
- The Windows service wrapper can use a configuration file to locate the startup batch file.
- Simplified the implementation of the GUI installation program.
- Reworded the read error: disconnected log message.
- Less verbose logging of no more messages to send.
- Qt4 or Qt5 selected by the configure script.
- Improved the RPM spec file.

## 1.9 -> 1.9.1

- Updated OpenSSL from 1.0.1e to 1.0.1g in the Windows build.

## 1.8.2 -> 1.9

- Added negotiated TLS/SSL for POP (ie. STLS).
- The first two fields in the secrets files are reordered (with backwards compatibility).
- Added Linux PAM authentication (configure --with-pam and then --server-auth=/pam).
- Optional protocol-specific --interface qualifiers, eg. --interface smtp=127.0.0.1,pop=192.168.1.1.
- Outgoing client connection bound with the first --interface or --interface client=... address.
- Support for SMTP-over-TLS on outgoing client connection (--client-tls-connection) (cf. STARTTLS)
- Support for SOCKS 4a on outgoing client connection, eg. --forward-to example.com:25@127.0.0.1:9050.
- TLS configuration options (--tls-config=...) for SSLv2/3 fallback etc.
- No Received line added if --anonymous and an empty --domain name.
- Error text for all recipients rejected is now more accurately one or more recipients rejected.
- New behaviour for --client-filter exit values of 100 and over.
- New commands on the admin interface, failures and unfail-all.
- Shorter descriptions in the usage help unless --verbose.
- New default spool directory location on windows, now under system32.
- Windows project files for MSVC 2012 included.
- Removed support for Windows NT and Windows 9x.
- Better support for Windows Vista and Windows 7.
- Removed Windows --icon option.
- Removed --enable-fhs option for configure (see INSTALL document for equivalent usage).
- Added --log-file option to redirect stderr.
- Added Windows --peer-lookup option.
- Fix for MD5 code in 64-bit builds.

## 1.8.1 -> 1.8.2

- Fix namespaces for gcc 3.4.

## 1.8 -> 1.8.1

- Changed the definition of --as-proxy to use --poll 0 rather than --immediate [bug-id 1961652].
- Fixed stalling bug when using server-side TLS/SSL (--server-tls) [bug-id 1961655].
- Improved Debian packaging for Linux (make deb).

## 1.7 -> 1.8

- Speed optimisations (as identified by KCachegrind/valgrind in KDevelop).
- Build-time size optimisations (eg. ./configure --disable-exec --enable-small-exceptions ...).
- Build-time options to reduce runtime library dependencies (eg. ./configure --disable-dns --disable-identity).
- New switch to limit the size of submitted messages (--size).
- New semantics for --poll 0, providing a good alternative to --immediate when proxying.
- SMTP client protocol emits a RSET after a rejected recipient as a workround for broken server protocols.
- SMTP client protocol continues if the server advertises AUTH but the client has no authentication secrets.
- When a message cannot be forwarded the offending SMTP protocol response number, if any, is put in the envelope file.
- A warning is printed if logging is requested but both stderr and syslog are disabled.
- A cross-compiling toolchain builder script added for running on mips-based routers (extra/mips).
- New example scripts for SMTP multicasting and editing envelope files.
- Improved native support for Mac OS X (10.5) with graphical installation from disk image.
- Compatibility with gcc 2.95 restored.

## 1.6 -> 1.7

- TLS/SSL support for SMTP using OpenSSL (./configure --with-openssl with --client-tls and --server-tls).
- Authentication mechanism PLAIN added.
- Some tightening up of the SMTP server protocol.
- Windows service wrapper has an --uninstall option.
- Windows installation GUI uninstalls the service before reinstalling it.

## 1.5 -> 1.6

- GPLv3 licence (see http://gplv3.fsf.org).
- New --prompt-timeout switch for the timeout when waiting for the initial 220 prompt from the SMTP server.
- Fix for flow-control assertion error when the POP server sends a very long list of spooled messages.
- Wildcard matching for trusted IP addresses in the authentication secrets file can now use CIDR notation.
- More fine-grained switching of effective user-id to read files and directories when running as root.
- Fewer new client connections when proxying.
- The server drops the connection if a remote SMTP client causes too many protocol errors.
- More complete implementation of --hidden on Windows.
- Scanner switch (--scanner) replaced by a more general --filter and --client-filter switch syntax.
- Support for address verification (--verifier) over the network.
- Better support for running as a Windows service (emailrelay-service --install).
- Utility filter program emailrelay-filter-copy exits with 100 if it deletes the envelope file.
- Windows cscript.exe wrapper is added automatically to non-bat/exe --filter command-lines.
- Installation GUI makes backups of the files it edits and preserves authentication secrets.
- Installation GUI can install init.d links.
- Experimental SpamAssassin spamc/spamd protocol support.
- Acceptance tests added to the distribution.

## 1.4 -> 1.5

- New installation and configuration GUI using TrollTech Qt 4.x (./configure --enable-gui)
- Default address verifier accepts all addresses as valid and never treats them as local mailboxes.
- Fix for server exit bug when failing to send data down a newly accepted connection.
- Spooled content files can be left in the parent directory to save diskspace when using --pop-by-name.
- Client protocol improved for the case where there are no valid recipients.
- New --syslog switch to override --no-syslog.
- New --filter-timeout switch added.
- Support for --foo=bar switch syntax (ie. with =).
- Multiple listening interfaces allowed with a comma-separated --interface list.
- New --filter utility called emailrelay-filter-copy to support --pop-by-name.
- Documentation also created in docbook format (requires xmlto).
- Windows installation document revised.

## 1.3.3 -> 1.4

- POP3 server (enable with --pop, disable at build-time with ./configure --disable-pop).
- Fix for logging reentrancy bug (affects ./configure --enable-debug with --debug).
- Fix to ensure sockets are always non-blocking (affects --scanner).
- Allow --verifier scripts to reject addresses with a temporary 4xx error code.
- Automatic re-reading of secrets files.
- Write to the Windows event log even if no write access to the registry.
- Modification of set-group-id policy if not started as root.
- Better checking of spool directory access on startup.
- New emailrelay-submit.sh example script for submitting messages for --pop-by-name.
- The --dont-listen switch is now --no-smtp.
- Better IPv6 support (Linux only).

## 1.3.2 -> 1.3.3

- No bind() for outgoing connections [bug-id 1051689].
- Updated rpm spec file [bug-id 1224850].
- Fix for gcc3.4 compilation error in md5.cpp.
- Fix for glob()/size_t compilation warning.
- Documentation of auth switches corrected.
- State-machine template type declaration modernised, possibly breaking older compilers.

## 1.3.1 -> 1.3.2

- Fix for core dump when --client-filter pre-processing fails.
- Revised code structure to prepare for asynchronous pre-processing.
- Better diagnostics when pre-processor exec() fails.
- Better cleanup of empty and orphaned files.

## 1.3 -> 1.3.1

- Windows resource leak from CreateProcess() fixed.
- Windows dialog box double-close fix.
- Some documentation for the --scanner switch.
- New usage patterns section in the user guide.

## 1.2 -> 1.3

- Client protocol waits for a greeting from the server on startup [bug-id 842156].
- Fix for incorrect backslash normalisation on --verifier command-lines containing spaces [bug-id 890646].
- Verifier programs can now summarily abort a connection using an exit value of 100.
- New --anonymous switch that reduces information leakage to the SMTP client and disables VRFY.
- Better validation of MAIL-FROM and RCPT-TO formatting.
- Rewrite of low-level MD5 code.
- Performance tuning.
- Template emailrelay.conf gets installed in /etc.
- New switches for the configure script.
- More JavaScript example scripts.

## 1.1.2 -> 1.2

- The --filter and --verifier arguments interpreted as command-lines; spaces in executable paths now need escaping.
- The --interface switch applies to outgoing connections too.
- New --client-filter switch to do synchronous message processing before sending.
- Keeps authentication after a rset command.
- Fix for dangling reference bug, seen after quit command on Windows.
- JavaScript examples in the documentation.

## 1.1.1 -> 1.1.2

- Earlier check for un-bindable ports on startup, and later fork()ing [bug-id 776972].
- Resolved the file-descriptor kludge for --verifier on Windows.
- Less strict about failing eight bit messages sent to servers with no 8BITMIME extension.
- Supplementary group memberships revoked at startup if root or suid.
- Pre-processor (--filter) program's standard output searched for a failure reason string.
- Undocumented --scanner switch added for asynchronous processing by a separate network server.

## 1.1.0 -> 1.1.1

- Restored the fix for building with gcc2.96.
- Support for MinGW builds on Windows.
- More reasonable size of the --help --verbose message box on Windows.
- Windows --icon switch changed from -i to -c to avoid conflicting with --interface.
- Shows next server address correctly in the configuration report when using --forward-to.
- Fix for make install when man2html is not available.
- Updated init script.

## 1.0.2 -> 1.1.0

- In proxy mode unexpected client-side disconnects and timeouts do not leave .bad files [see also bug-id 659039].
- By default proxy mode does not interpret addresses for local delivery (--postmaster).
- Polling option added (--poll) to rescan the spool directory periodically.
- New special exit code (103) for the pre-processor to trigger immediate polling; 100 to 107 now reserved.
- Orphaned zero-length content files are deleted properly if the server-side dialogue is cut short.
- The --interface switch applies to the --admin interface too.
- Improved internal event architecture using slot/signal design pattern, and fewer singleton classes.
- Event notification available through the administration interface.
- New --hidden switch for Windows.
- Syslog output includes process-id.
- Support for Sun WorkShop 5.0 added.
- Documentation overhaul.

## 1.0.0 -> 1.0.2

- Support for trusted IP addresses, allowing certain clients to avoid authentication.
- Address verifier interface extended to include authentication information.
- New public mail relay section added to the user guide.
- Example verifier scripts etc. added to the reference guide.

## 1.0.0 -> 1.0.1

- In proxy mode unexpected client-side disconnects and timeouts result in .bad files [bug-id 659039].
- Require successful AUTH before MAIL FROM when using --server-auth.
- Better word-wrap on --help output.
- Use of RedHat's functions code, and support for chkconfig, added to the init.d script.
- Builds with gcc3.2 (1.0.0-pl5).
- Fix for files left as busy after a connection failure in proxy mode [bug-id 631032] (1.0.0-pl3/4/5).
- Trivial documentation fixes (1.0.0-pl3).
- Fix for the double-dot escape bug in the client protocol [bug-id 611624] (1.0.0-pl2).
- Fix build when using gcc2.96 rather than gcc2.95 (1.0.0-pl1).
- Fix default spool directory in example scripts (1.0.0-pl1).

## 0.9.9 -> 1.0.0

- Briefer --help output; works with --verbose.
- Option to listen on a specific network interface (--interface).
- Option for an external address verifier program (--verifier).
- Some Linux Standard Base stuff added to the init.d script.
- Pid files world-readable and deleted on abnormal termination.
- Compiles with gcc 3.0 and intel 6.0.
- Autoconf tweak for MacOS X.
- Corrected the Received: typo [bug-id 572236].
- EHLO response parsing is now case-insensitive [bug-id 561522].
- Fewer missing-secrets warnings [bug-id 564987].

## 0.9.8 -> 0.9.9

- More flexible logging options (--verbose and --debug work better).
- File Hierarchy Standard (FHS) option for configure (--enable-fhs).
- FHS-compatible RPMs.
- Spool files writeable by pre-processor when server started as root.
- Default directories in executables and scripts come from configure.
- The init.d script is renamed emailrelay (was emailrelay.sh).
- Man pages are gzipped when installed.
- Fix for access violation under Windows NT when client disconnects.
- Use of event log when compiled on Windows NT.
- Fix for info-after-flush bug when using the administration interface. [rc2]
- New resubmit script. [rc2]
- Submit utility works under Windows. [rc2]
- Improved Windows project files. [rc2]

## 0.9.7 -> 0.9.8

- Fix for running pre-processor (--filter) as root.
- Ignore bogus AUTH=LOGIN lines in EHLO response.
- Submit utility improved to work with mutt.
- Installation of submit man page.

## 0.9.6 -> 0.9.7

- CRAM-MD5 authentication mechanism added.
- Revoke root permissions at start up, and reclaim them when needed.
- Allow mail pre-processing (--filter) when started as root.
- Domain-override switch (--domain) added.
- Non-privileged user switch (--user) added.
- Better handling of NarrowPipe exception (ie. 8-bit message to 7-bit server).
- Allow null return path in MAIL-FROM.
- Reject recipients which look like @localhost (as used by fetchmail for local delivery).
- Treat recipients which look like postmaster@localhost or postmaster@ as local postmaster.
- Optional timestamps on log output (--log-time).
- Fix EHLO to HELO fallback for 501/502 responses in client protocol.
- Submission utility emailrelay-submit added.
- HTML4.0 compliant HTML documentation, using CSS.

## 0.9.5 -> 0.9.6

- SMTP AUTHentication extension -- LOGIN mechanism only.
- Client-side protocol timeout.
- Client-side connection timeout.
- Preprocessor can cancel further message processing.
- Client's IP address recorded in envelope files.
- Multiple hard-coded listening addresses supported at compile-time.
- Fix for automatic reopening of stderr stream.

## 0.9.4 -> 0.9.5

Windows fixes and improvements...

- system-tray + dialog-box user interface
- fix for dropped connections
- fix for content file deletion
- fix for directory iterator

## 0.9.3 -> 0.9.4

- Fixed memory leak when no --log switch.
- Windows build is more gui and less command-line.
- Info command added to the administration interface.
- Doxygen files removed from binary RPM.

## 0.9.2 -> 0.9.3

- Proxy mode (--immediate and --as-proxy).
- Message pre-processing (--filter).
- Message store classes better separated using abstract interfaces.
- Improved notification script, with MIME encoding.
- Builds with old 2.91 version of gcc.

## 0.9.1 -> 0.9.2

- Better autoconf detection.
- Workround for FreeBSD uname() feature.
- Added missing .sh_ files to the distribution.
- Fixed a benign directory iterator bug.
- Use of gcc's exception header.

## 0.9 -> 0.9.1

- Improved documentation from doxygen.
- More complete use of namespaces.
- Experimental compile-time support for IPv6.