diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 404cdf0f564b..bad9d527f9a1 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -27,7 +27,7 @@ let
 
   mainCf =
     ''
-      compatibility_level = 2
+      compatibility_level = 9999
 
       mail_owner = ${user}
       default_privs = nobody
diff --git a/pkgs/servers/mail/postfix/2.11.nix b/pkgs/servers/mail/postfix/2.11.nix
deleted file mode 100644
index 7c936bf12446..000000000000
--- a/pkgs/servers/mail/postfix/2.11.nix
+++ /dev/null
@@ -1,66 +0,0 @@
-{ stdenv, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl, coreutils
-, findutils, gnugrep, gawk
-}:
-
-stdenv.mkDerivation rec {
-
-  name = "postfix-${version}";
-
-  version = "2.11.5";
-
-  src = fetchurl {
-    url = "ftp://ftp.cs.uu.nl/mirror/postfix/postfix-release/official/${name}.tar.gz";
-    sha256 = "11riz8ggaa09pi8d6xv2807qp7yjn918mrylfvkfwmvcdlgwck0a";
-  };
-
-  patches = [
-    ./postfix-2.11.0.patch
-    ./postfix-script-shell.patch
-  ];
-
-  buildInputs = [ makeWrapper gnused db openssl cyrus_sasl ];
-
-  preBuild = ''
-    sed -e '/^PATH=/d' -i postfix-install
-
-    export command_directory=$out/sbin
-    export config_directory=$out/etc/postfix
-    export daemon_directory=$out/libexec/postfix
-    export data_directory=/var/lib/postfix
-    export html_directory=$out/share/postfix/doc/html
-    export mailq_path=$out/bin/mailq
-    export manpage_directory=$out/share/man
-    export newaliases_path=$out/bin/newaliases
-    export queue_directory=/var/spool/postfix
-    export readme_directory=$out/share/postfix/doc
-    export sendmail_path=$out/bin/sendmail
-
-    make makefiles \
-      CCARGS='-DUSE_TLS -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I${cyrus_sasl}/include/sasl \
-              -fPIE -fstack-protector-all --param ssp-buffer-size=4 -O2 -D_FORTIFY_SOURCE=2' \
-      AUXLIBS='-ldb -lnsl -lresolv -lsasl2 -lcrypto -lssl -pie -Wl,-z,relro,-z,now'
-  '';
-
-  installTargets = [ "non-interactive-package" ];
-
-  installFlags = [ " install_root=$out " ];
-
-  postInstall = ''
-    mkdir -p $out
-    mv -v ut/$out/* $out/
-    sed -e '/^PATH=/d' -i $out/libexec/postfix/post-install
-    wrapProgram $out/libexec/postfix/post-install \
-      --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin
-    wrapProgram $out/libexec/postfix/postfix-script \
-      --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin:${gawk}/bin:${gnused}/bin
-  '';
-
-  meta = {
-    homepage = "http://www.postfix.org/";
-    description = "A fast, easy to administer, and secure mail server";
-    license = stdenv.lib.licenses.bsdOriginal;
-    platforms = stdenv.lib.platforms.linux;
-    maintainers = [ stdenv.lib.maintainers.rickynils ];
-  };
-
-}
diff --git a/pkgs/servers/mail/postfix/3.0.nix b/pkgs/servers/mail/postfix/3.0.nix
deleted file mode 100644
index 52327090e441..000000000000
--- a/pkgs/servers/mail/postfix/3.0.nix
+++ /dev/null
@@ -1,91 +0,0 @@
-{ stdenv, lib, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl
-, coreutils, findutils, gnugrep, gawk, icu, pcre
-, withPgSQL ? false, postgresql
-, withMySQL ? false, libmysql
-, withSQLite ? false, sqlite
-}:
-
-let
-  ccargs = lib.concatStringsSep " " ([
-    "-DUSE_TLS" "-DUSE_SASL_AUTH" "-DUSE_CYRUS_SASL" "-I${cyrus_sasl}/include/sasl"
-    "-DHAS_DB_BYPASS_MAKEDEFS_CHECK"
-    "-fPIE" "-fstack-protector-all" "--param" "ssp-buffer-size=4" "-O2" "-D_FORTIFY_SOURCE=2"
-   ] ++ lib.optional withPgSQL "-DHAS_PGSQL"
-     ++ lib.optionals withMySQL [ "-DHAS_MYSQL" "-I${libmysql}/include/mysql" ]
-     ++ lib.optional withSQLite "-DHAS_SQLITE");
-   auxlibs = lib.concatStringsSep " " ([
-     "-ldb" "-lnsl" "-lresolv" "-lsasl2" "-lcrypto" "-lssl" "-pie" "-Wl,-z,relro,-z,now"
-   ] ++ lib.optional withPgSQL "-lpq"
-     ++ lib.optional withMySQL "-lmysqlclient"
-     ++ lib.optional withSQLite "-lsqlite3");
-
-in stdenv.mkDerivation rec {
-
-  name = "postfix-${version}";
-
-  version = "3.0.3";
-
-  src = fetchurl {
-    url = "ftp://ftp.cs.uu.nl/mirror/postfix/postfix-release/official/${name}.tar.gz";
-    sha256 = "00mc12k5p1zlrlqcf33vh5zizaqr5ai8q78dwv69smjh6kn4c7j0";
-  };
-
-  buildInputs = [ makeWrapper gnused db openssl cyrus_sasl icu pcre ]
-                ++ lib.optional withPgSQL postgresql
-                ++ lib.optional withMySQL libmysql
-                ++ lib.optional withSQLite sqlite;
-
-  patches = [
-    ./postfix-script-shell.patch
-    ./postfix-3.0-no-warnings.patch
-    ./post-install-script.patch
-    ./relative-symlinks.patch
-  ];
-
-  preBuild = ''
-    sed -e '/^PATH=/d' -i postfix-install
-    sed -e "s|@PACKAGE@|$out|" -i conf/post-install
-
-    # post-install need skip permissions check/set on all symlinks following to /nix/store
-    sed -e "s|@NIX_STORE@|$NIX_STORE|" -i conf/post-install
-
-    export command_directory=$out/sbin
-    export config_directory=/etc/postfix
-    export meta_directory=$out/etc/postfix
-    export daemon_directory=$out/libexec/postfix
-    export data_directory=/var/lib/postfix/data
-    export html_directory=$out/share/postfix/doc/html
-    export mailq_path=$out/bin/mailq
-    export manpage_directory=$out/share/man
-    export newaliases_path=$out/bin/newaliases
-    export queue_directory=/var/lib/postfix/queue
-    export readme_directory=$out/share/postfix/doc
-    export sendmail_path=$out/bin/sendmail
-
-    make makefiles CCARGS='${ccargs}' AUXLIBS='${auxlibs}'
-  '';
-
-  installTargets = [ "non-interactive-package" ];
-
-  installFlags = [ "install_root=installdir" ];
-
-  postInstall = ''
-    mkdir -p $out
-    mv -v installdir/$out/* $out/
-    cp -rv installdir/etc $out
-    sed -e '/^PATH=/d' -i $out/libexec/postfix/post-install
-    wrapProgram $out/libexec/postfix/post-install \
-      --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin
-    wrapProgram $out/libexec/postfix/postfix-script \
-      --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin:${gawk}/bin:${gnused}/bin
-  '';
-
-  meta = {
-    homepage = "http://www.postfix.org/";
-    description = "A fast, easy to administer, and secure mail server";
-    license = lib.licenses.bsdOriginal;
-    platforms = lib.platforms.linux;
-    maintainers = [ lib.maintainers.rickynils ];
-  };
-
-}
diff --git a/pkgs/servers/mail/postfix/db-linux3.patch b/pkgs/servers/mail/postfix/db-linux3.patch
deleted file mode 100644
index c9dd4646798a..000000000000
--- a/pkgs/servers/mail/postfix/db-linux3.patch
+++ /dev/null
@@ -1,39 +0,0 @@
-diff --git a/makedefs b/makedefs
-index b8b98c8..94443c0 100644
---- a/makedefs
-+++ b/makedefs
-@@ -341,20 +341,20 @@ EOF
- 		esac
- 		;;
-     Linux.3*)	SYSTYPE=LINUX3
--		if [ -f /usr/include/db.h ]
--		then
--		    : we are all set
--		elif [ -f /usr/include/db/db.h ]
--		then
--		    CCARGS="$CCARGS -I/usr/include/db"
--		else
--		    # On a properly installed system, Postfix builds
--		    # by including <db.h> and by linking with -ldb
--		    echo "No <db.h> include file found." 1>&2
--		    echo "Install the appropriate db*-devel package first." 1>&2
--		    echo "See the RELEASE_NOTES file for more information." 1>&2
--		    exit 1
--		fi
-+		#if [ -f /usr/include/db.h ]
-+		#then
-+		    #: we are all set
-+		#elif [ -f /usr/include/db/db.h ]
-+		#then
-+		    #CCARGS="$CCARGS -I/usr/include/db"
-+		#else
-+		    ## On a properly installed system, Postfix builds
-+		    ## by including <db.h> and by linking with -ldb
-+		    #echo "No <db.h> include file found." 1>&2
-+		    #echo "Install the appropriate db*-devel package first." 1>&2
-+		    #echo "See the RELEASE_NOTES file for more information." 1>&2
-+		    #exit 1
-+		#fi
- 		SYSLIBS="-ldb"
- 		for name in nsl resolv
- 		do
diff --git a/pkgs/servers/mail/postfix/default.nix b/pkgs/servers/mail/postfix/default.nix
index 838ca7a8d8df..52327090e441 100644
--- a/pkgs/servers/mail/postfix/default.nix
+++ b/pkgs/servers/mail/postfix/default.nix
@@ -1,70 +1,91 @@
-{ stdenv, fetchurl, db, glibc, openssl, cyrus_sasl
-, coreutils, findutils, gnused, gnugrep, bison, perl
+{ stdenv, lib, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl
+, coreutils, findutils, gnugrep, gawk, icu, pcre
+, withPgSQL ? false, postgresql
+, withMySQL ? false, libmysql
+, withSQLite ? false, sqlite
 }:
 
-assert stdenv.isLinux;
+let
+  ccargs = lib.concatStringsSep " " ([
+    "-DUSE_TLS" "-DUSE_SASL_AUTH" "-DUSE_CYRUS_SASL" "-I${cyrus_sasl}/include/sasl"
+    "-DHAS_DB_BYPASS_MAKEDEFS_CHECK"
+    "-fPIE" "-fstack-protector-all" "--param" "ssp-buffer-size=4" "-O2" "-D_FORTIFY_SOURCE=2"
+   ] ++ lib.optional withPgSQL "-DHAS_PGSQL"
+     ++ lib.optionals withMySQL [ "-DHAS_MYSQL" "-I${libmysql}/include/mysql" ]
+     ++ lib.optional withSQLite "-DHAS_SQLITE");
+   auxlibs = lib.concatStringsSep " " ([
+     "-ldb" "-lnsl" "-lresolv" "-lsasl2" "-lcrypto" "-lssl" "-pie" "-Wl,-z,relro,-z,now"
+   ] ++ lib.optional withPgSQL "-lpq"
+     ++ lib.optional withMySQL "-lmysqlclient"
+     ++ lib.optional withSQLite "-lsqlite3");
 
-stdenv.mkDerivation rec {
-  name = "postfix-2.8.12";
+in stdenv.mkDerivation rec {
+
+  name = "postfix-${version}";
+
+  version = "3.0.3";
 
   src = fetchurl {
     url = "ftp://ftp.cs.uu.nl/mirror/postfix/postfix-release/official/${name}.tar.gz";
-    sha256 = "11z07mjy53l1fnl7k4101yk4ilibgqr1164628mqcbmmr8bh2szl";
+    sha256 = "00mc12k5p1zlrlqcf33vh5zizaqr5ai8q78dwv69smjh6kn4c7j0";
   };
 
-  buildInputs = [db openssl cyrus_sasl bison perl];
+  buildInputs = [ makeWrapper gnused db openssl cyrus_sasl icu pcre ]
+                ++ lib.optional withPgSQL postgresql
+                ++ lib.optional withMySQL libmysql
+                ++ lib.optional withSQLite sqlite;
 
   patches = [
-    ./postfix-2.2.9-db.patch
-    ./postfix-2.2.9-lib.patch
-    ./db-linux3.patch
     ./postfix-script-shell.patch
+    ./postfix-3.0-no-warnings.patch
+    ./post-install-script.patch
+    ./relative-symlinks.patch
   ];
 
-  postPatch = ''
-    sed -i -e s,/usr/bin,/var/run/current-system/sw/bin, \
-      -e s,/usr/sbin,/var/run/current-system/sw/bin, \
-      -e s,:/sbin,, src/util/sys_defs.h
-  '';
-
   preBuild = ''
-    export daemon_directory=$out/libexec/postfix
-    export command_directory=$out/sbin
-    export queue_directory=/var/spool/postfix
-    export sendmail_path=$out/bin/sendmail
-    export mailq_path=$out/bin/mailq
-    export newaliases_path=$out/bin/newaliases
-    export html_directory=$out/share/postfix/doc/html
-    export manpage_directory=$out/share/man
-    export sample_directory=$out/share/postfix/doc/samples
-    export readme_directory=$out/share/postfix/doc
-
-    make makefiles CCARGS='-DUSE_TLS -DUSE_SASL_AUTH -DUSE_CYRUS_SASL -I${cyrus_sasl}/include/sasl -fPIE -fstack-protector-all --param ssp-buffer-size=4 -O2 -D_FORTIFY_SOURCE=2' AUXLIBS='-lssl -lcrypto -lsasl2 -ldb -lnsl -pie -Wl,-z,relro,-z,now'
-  '';
-
-  installPhase = ''
     sed -e '/^PATH=/d' -i postfix-install
-    $SHELL postfix-install install_root=out -non-interactive -package
+    sed -e "s|@PACKAGE@|$out|" -i conf/post-install
 
-    mkdir -p $out
-    mv -v "out$out/"* $out/
+    # post-install need skip permissions check/set on all symlinks following to /nix/store
+    sed -e "s|@NIX_STORE@|$NIX_STORE|" -i conf/post-install
 
-    mkdir -p $out/share/postfix
-    mv conf $out/share/postfix/
-    mv LICENSE TLS_LICENSE $out/share/postfix/
+    export command_directory=$out/sbin
+    export config_directory=/etc/postfix
+    export meta_directory=$out/etc/postfix
+    export daemon_directory=$out/libexec/postfix
+    export data_directory=/var/lib/postfix/data
+    export html_directory=$out/share/postfix/doc/html
+    export mailq_path=$out/bin/mailq
+    export manpage_directory=$out/share/man
+    export newaliases_path=$out/bin/newaliases
+    export queue_directory=/var/lib/postfix/queue
+    export readme_directory=$out/share/postfix/doc
+    export sendmail_path=$out/bin/sendmail
 
-    sed -e 's@^PATH=.*@PATH=${coreutils}/bin:${findutils}/bin:${gnused}/bin:${gnugrep}/bin:'$out'/sbin@' -i $out/share/postfix/conf/post-install $out/libexec/postfix/post-install
-    sed -e '2aPATH=${coreutils}/bin:${findutils}/bin:${gnused}/bin:${gnugrep}/bin:'$out'/sbin' -i $out/share/postfix/conf/postfix-script $out/libexec/postfix/postfix-script
-    chmod a+x $out/share/postfix/conf/{postfix-script,post-install}
+    make makefiles CCARGS='${ccargs}' AUXLIBS='${auxlibs}'
   '';
 
-  inherit glibc;
+  installTargets = [ "non-interactive-package" ];
+
+  installFlags = [ "install_root=installdir" ];
+
+  postInstall = ''
+    mkdir -p $out
+    mv -v installdir/$out/* $out/
+    cp -rv installdir/etc $out
+    sed -e '/^PATH=/d' -i $out/libexec/postfix/post-install
+    wrapProgram $out/libexec/postfix/post-install \
+      --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin
+    wrapProgram $out/libexec/postfix/postfix-script \
+      --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin:${gawk}/bin:${gnused}/bin
+  '';
 
   meta = {
     homepage = "http://www.postfix.org/";
-    description = "a fast, easy to administer, and secure mail server";
-    license = stdenv.lib.licenses.bsdOriginal;
-    platforms = stdenv.lib.platforms.linux;
-    maintainers = [ stdenv.lib.maintainers.simons ];
+    description = "A fast, easy to administer, and secure mail server";
+    license = lib.licenses.bsdOriginal;
+    platforms = lib.platforms.linux;
+    maintainers = [ lib.maintainers.rickynils ];
   };
+
 }
diff --git a/pkgs/servers/mail/postfix/postfix-2.11.0.patch b/pkgs/servers/mail/postfix/postfix-2.11.0.patch
deleted file mode 100644
index cdc4521c428a..000000000000
--- a/pkgs/servers/mail/postfix/postfix-2.11.0.patch
+++ /dev/null
@@ -1,76 +0,0 @@
-diff -ruN postfix-2.11.0-orig/makedefs postfix-2.11.0/makedefs
---- postfix-2.11.0-orig/makedefs	2014-01-05 18:18:56.000000000 +0100
-+++ postfix-2.11.0/makedefs	2014-04-24 09:27:58.193869491 +0200
-@@ -290,36 +290,6 @@
- 		esac
- 		;;
-     Linux.2*)	SYSTYPE=LINUX2
--		case "$CCARGS" in
--		 *-DNO_DB*) ;;
--		 *-DHAS_DB*) ;;
--		 *) if [ -f /usr/include/db.h ]
--		    then
--			: we are all set
--		    elif [ -f /usr/include/db/db.h ]
--		    then
--			CCARGS="$CCARGS -I/usr/include/db"
--		    else
--			# No, we're not going to try db1 db2 db3 etc.
--			# On a properly installed system, Postfix builds
--			# by including <db.h> and by linking with -ldb
--			echo "No <db.h> include file found." 1>&2
--			echo "Install the appropriate db*-devel package first." 1>&2
--			exit 1
--		    fi
--		    SYSLIBS="-ldb"
--		    ;;
--		esac
--		for name in nsl resolv $GDBM_LIBS
--		do
--		    for lib in /usr/lib64 /lib64 /usr/lib /lib
--		    do
--			test -e $lib/lib$name.a -o -e $lib/lib$name.so && {
--			    SYSLIBS="$SYSLIBS -l$name"
--			    break
--			}
--		    done
--		done
- 		# Kernel 2.4 added IPv6
- 		case "$RELEASE" in
- 		2.[0-3].*) CCARGS="$CCARGS -DNO_IPV6";;
-@@ -363,35 +333,6 @@
- 		esac
- 		;;
-     Linux.3*)	SYSTYPE=LINUX3
--		case "$CCARGS" in
--		 *-DNO_DB*) ;;
--		 *-DHAS_DB*) ;;
--		 *) if [ -f /usr/include/db.h ]
--		    then
--			: we are all set
--		    elif [ -f /usr/include/db/db.h ]
--		    then
--			CCARGS="$CCARGS -I/usr/include/db"
--		    else
--			# On a properly installed system, Postfix builds
--			# by including <db.h> and by linking with -ldb
--			echo "No <db.h> include file found." 1>&2
--			echo "Install the appropriate db*-devel package first." 1>&2
--			exit 1
--		    fi
--		    SYSLIBS="-ldb"
--		    ;;
--		esac
--		for name in nsl resolv
--		do
--		    for lib in /usr/lib64 /lib64 /usr/lib /usr/lib/* /lib /lib/*
--		    do
--			test -e $lib/lib$name.a -o -e $lib/lib$name.so && {
--			    SYSLIBS="$SYSLIBS -l$name"
--			    break
--			}
--		    done
--		done
- 		;;
-      GNU.0*|GNU/kFreeBSD.[567]*)
- 		SYSTYPE=GNU0
diff --git a/pkgs/servers/mail/postfix/postfix-2.2.9-db.patch b/pkgs/servers/mail/postfix/postfix-2.2.9-db.patch
deleted file mode 100644
index 65f55ffd8f05..000000000000
--- a/pkgs/servers/mail/postfix/postfix-2.2.9-db.patch
+++ /dev/null
@@ -1,40 +0,0 @@
-diff -ruN postfix-2.2.9/makedefs postfix-2.2.9.new/makedefs
---- postfix-2.2.9/makedefs	2006-01-03 21:50:25.000000000 +0000
-+++ postfix-2.2.9.new/makedefs	2006-03-11 00:38:30.000000000 +0000
-@@ -219,21 +219,21 @@
- 		;;
-     Linux.2*)	SYSTYPE=LINUX2
- 		# Postfix no longer needs DB 1.85 compatibility
--		if [ -f /usr/include/db.h ]
--		then
--		    : we are all set
--		elif [ -f /usr/include/db/db.h ]
--		then
--		    CCARGS="$CCARGS -I/usr/include/db"
--		else
--		    # No, we're not going to try db1 db2 db3 etc.
--		    # On a properly installed system, Postfix builds
--		    # by including <db.h> and by linking with -ldb
--		    echo "No <db.h> include file found." 1>&2
--		    echo "Install the appropriate db*-devel package first." 1>&2
--		    echo "See the RELEASE_NOTES file for more information." 1>&2
--		    exit 1
--		fi
-+		#if [ -f /usr/include/db.h ]
-+		#then
-+		    #: we are all set
-+		#elif [ -f /usr/include/db/db.h ]
-+		#then
-+		    #CCARGS="$CCARGS -I/usr/include/db"
-+		#else
-+		    ## No, we're not going to try db1 db2 db3 etc.
-+		    ## On a properly installed system, Postfix builds
-+		    ## by including <db.h> and by linking with -ldb
-+		    #echo "No <db.h> include file found." 1>&2
-+		    #echo "Install the appropriate db*-devel package first." 1>&2
-+		    #echo "See the RELEASE_NOTES file for more information." 1>&2
-+		    #exit 1
-+		#fi
- 		# GDBM locks the DBM .pag file after open. This breaks postmap.
- 		# if [ -f /usr/include/gdbm-ndbm.h ]
- 		# then
diff --git a/pkgs/servers/mail/postfix/postfix-2.2.9-lib.patch b/pkgs/servers/mail/postfix/postfix-2.2.9-lib.patch
deleted file mode 100644
index 03dcaa87f238..000000000000
--- a/pkgs/servers/mail/postfix/postfix-2.2.9-lib.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff -ruN postfix-2.2.9/makedefs postfix-2.2.9.new/makedefs
---- postfix-2.2.9/makedefs	2006-01-03 21:50:25.000000000 +0000
-+++ postfix-2.2.9.new/makedefs	2006-03-11 01:40:30.000000000 +0000
-@@ -247,7 +247,7 @@
- 		SYSLIBS="-ldb"
- 		for name in nsl resolv $GDBM_LIBS
- 		do
--		    for lib in /usr/lib64 /lib64 /usr/lib /lib
-+		    for lib in $glibc/usr/lib64 $glibc/lib64 $glibc/usr/lib $glibc/lib
- 		    do
- 			test -e $lib/lib$name.a -o -e $lib/lib$name.so && {
- 			    SYSLIBS="$SYSLIBS -l$name"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 603e451116c6..4f089fd9dded 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9709,10 +9709,7 @@ let
 
   popa3d = callPackage ../servers/mail/popa3d { };
 
-  postfix28 = callPackage ../servers/mail/postfix { };
-  postfix211 = callPackage ../servers/mail/postfix/2.11.nix { };
-  postfix30 = callPackage ../servers/mail/postfix/3.0.nix { };
-  postfix = postfix30;
+  postfix = callPackage ../servers/mail/postfix { };
 
   postsrsd = callPackage ../servers/mail/postsrsd { };