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[Bug-mailfromd] mailfromd-8.15 released [stable]


I'm glad to announce the release of mailfromd version 8.15.  This release
appears with a significant delay due to reasons far beyond my control.
Nevertheless, here it is and I would like to thank Jan Rafaj and
<Marc@xxxxxxxxxxxxxxxxx> for new ideas and help in debugging it.  This
release comes in sync with three new dynamically loaded modules, which provide
interface to LDAP, introduce Perl-compatible regular expressions and enable
mailfromd to output its metrics using OpenMetrics protocol.  See below for
a detailed list of new features in this release.

Here are the compressed sources:
  https://download.gnu.org.ua/pub/release/mailfromd/mailfromd-8.15.tar.gz   (2.3MB)
  https://download.gnu.org.ua/pub/release/mailfromd/mailfromd-8.15.tar.bz2  (1.7MB)
  https://download.gnu.org.ua/pub/release/mailfromd/mailfromd-8.15.tar.xz   (1.3MB)

Here are the GPG detached signatures[*]:

Here are the SHA1 and SHA256 checksums:

16a72aabd71b5912cc8a4cdbfb9102e617c3925b  mailfromd-8.15.tar.gz
Nq2lLsrstLcgxjzUYyzfD7A96Cf10Wqw6fmPuTxex1U  mailfromd-8.15.tar.gz
fb29ca4e72b4d95403d7383b10ebbc8f0012b15e  mailfromd-8.15.tar.bz2
N9veD5usYgSwoY1cxfNeVZqKUt3QmVqnLbF3KQMv2oA  mailfromd-8.15.tar.bz2
c4a90749e7431b1b0941cbca0081d4eff9133f46  mailfromd-8.15.tar.xz
Ki0BwMg0hy/juQstbh7Sy+Sh0sudl1cDpMRfZ6MAeeo  mailfromd-8.15.tar.xz

The SHA256 checksum is base64 encoded, instead of the
hexadecimal encoding that most checksum tools default to.

[*] Use a .sig file to verify that the corresponding file (without the
.sig suffix) is intact.  First, be sure to download both the .sig file
and the corresponding tarball.  Then, run a command like this:

  gpg --verify mailfromd-8.15.tar.gz.sig

If that command fails because you don't have the required public key,
try the following command to get it and then rerun the 'gpg --verify' 

    gpg --keyserver keyserver.ubuntu.com --recv-keys 3602B07F55D0C732

You may also try other key servers such as pgp.mit.edu.  With newer GnuPG 
versions you may use the following command to download and refresh any 
expired key:

  gpg --auto-key-locate=clear,wkd,nodefault --locate-key 3602B07F55D0C732

Noteworthy changes in this release

* Default MFL source file suffix

The default suffix for MFL files is changed to '.mfl'.  In particular,
the master script file is now "mailfromd.mfl".  This change is
intended to avoid confusion with Metafont files, which have suffix

As of this version, the new suffix is recommended, but not obligatory:
the legacy '.mf' suffix is still supported.  If a file 'X.mfl' is not
found, mailfromd will look for 'X.mf'.

* MFL module search path

MFL modules loaded using the "require" or "import" statements are
looked up in module search path.  Previously, they were searched for
in include search path, which created confusion, since include
search path is intended for use by preprocessor.  To maintain backward
compatibility, if mailfromd is unable to find a module in module
search path, it will retry the search using include path.  This
behavior will be maintained during a transitional period (a couple of
releases), after which searches in include search path will be

* Preprocessor configuration

Use of preprocessor is configured by the following statement in the
main configuration file:

  preprocessor {
    # Enable preprocessor.
    enable yes;
    # Preprocessor command line stub.
    command "m4 -s";
    # Pass current include path to the preprocessor via -I options.
    pass-includes false;
    # Pass to the preprocessor the feature definitions via -D options
    # as well as any -D/-U options from the command line.
    pass-defines true;
    # Name of the preprocessor setup file.  Unless absolute, it is
    # looked up in the include path.
    setup-file "pp-setup";

If preprocessor.pass-includes is true, the preprocessor.command
setting is augmented by zero or more -I options, thereby supplying it
the mailfromd include path.

Furthermore, if preprocessor.pass-defines is set, zero or more
-D options defining optional features are passed to it (e.g.
-DWITH_DKIM) as well as any -D and -U options from the mailfromd
command line.

Unless the value of preprocessor.setup-file begins with a slash,
the file with this name is looked up in the current include search
path.  If found, its absolute name is passed to the preprocessor as
first argument.

If the value begins with a slash, it is passed to the preprocessor
as is.

* New MFL operator: $@

The $@ operator can be used as the last argument in a call to
variadic function from another variadic function.  It passes
all variable arguments supplied to the calling function on to
the function being called.  E.g.:

    func x(...)
      # do something

    func y(string x, ...)

In this example, if "y" is called as y("text", 1, 2, 3) it will call
"x" as x(1, 2, 3).

This operator can also be used with a numeric argument: $@(N).  In
this case, it will remove first N elements from the argument list and
push remaining ones on stack.  This is similar to the 'shift'
operator in other programming languages, e.g.:


* Data types in variadic function declaration

The ellipsis in a variadic function declaration can be preceded by
the data type, e.g.:

  func sum (number ...) returns number

For compatibility with previous versions, if the type is omitted,
string is assumed.

* The void() type cast

The void() type cast can be used around a function call to indicate
that its return value is ignored deliberately.

* mfmod: dynamically loaded modules

This new type of mailfromd modules uses dynamically loaded libraries
to extend the program functionality without having to modify its code.
For a detailed discussion see the manual, section 4.22, "Dynamically
Loaded Modules".

Three mfmods were released together with mailfromd 8.15:

  - https://www.gnu.org.ua/software/mfmod_ldap/
    LDAP searches.

  - https://www.gnu.org.ua/software/mfmod_openmetrics
    Open metrics support.

  - https://www.gnu.org.ua/software/mfmod_prce/
    Support for Perl-comparible regular expressions.

* Syntax of special handler definitions

Special handlers ("begin" and "end", in particular) are now defined using
the standard "prog" keyword (similar to milter state handlers):

  prog begin

  prog end

Old syntax is supported for backward compatibility, but causes a
deprecation warning.  Application writers are advised to update their

* New special handlers: startup and shutdown

These two handlers provide global initialization and cleanup routines.
The "startup" handler is run by the master mailfromd process as part
of the startup sequence, before the program starts to serve any milter
requests.  The "shutdown" handler is run when mailfromd is about to

Notice an important differences between "startup"/"shutdown" and
"begin"/"end" special handlers.  The latter are session specific: they
are run at the start and end of a milter session.  The former are
global: they are run at the program startup and shutdown.

The "startup" handler is normally used by mfmod interface modules to
load the corresponding shared library.

* Use of STARTTLS in callout

If TLS is supported by libmailutils, the SMTP callout code will use
STARTTLS when offered by the remote server.  This is controlled by the
smtp-starttls configuration statement.  Its possible values are:

    Never use STARTTLS.

    Always use STARTTLS if offered by the server.

    Use STARTTLS only if MAIL FROM: command failed with the code
    530 (Authorization required).

The default is "ondemand".

* Qualified DBM file names in database configuration

Argument to database.file statement can be prefixed with "database
scheme" to select alternative DBM implementation.  For example:

  database rate {
     file "gdbm://rate.db";

See the manual, section 7.11 "Database Configuration" for details.

* New command line option: --echo

The --echo option allows you to control where the output of the "echo"
statement goes in "run" and "test" modes.  When used without argument
it directs the output to the standard output stream.  If an argument
is supplied (as in: --echo=FILE), the output goes to the named file.
The file will be created if it doesn't exist.  Notice, that in the
latter case, the use of '=' is compulsory (--echo FILE won't work).

* Deprecated configuration statements removed

Deprecated configuration statements `lock-retry-count' and
`lock-retry-timeout' were removed in this version.  Use
the `locking' statement instead, e.g. instead of

  lock-retry-count 10;
  lock-retry-timeout 1;


  locking {
    retry-count 10;
    retry-sleep 1;

* Removed support for obsolete features: legacy GeoIP and DSPAM

Best regards,