diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index bad9d527f9a..404cdf0f564 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -27,7 +27,7 @@ let
 
   mainCf =
     ''
-      compatibility_level = 9999
+      compatibility_level = 2
 
       mail_owner = ${user}
       default_privs = nobody
diff --git a/pkgs/servers/mail/postfix/2.11.nix b/pkgs/servers/mail/postfix/2.11.nix
new file mode 100644
index 00000000000..7c936bf1244
--- /dev/null
+++ b/pkgs/servers/mail/postfix/2.11.nix
@@ -0,0 +1,66 @@
+{ stdenv, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl, coreutils
+, findutils, gnugrep, gawk
+}:
+
+stdenv.mkDerivation rec {
+
+  name = "postfix-${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:${gnused}/bin
+  '';
+
+  meta = {
+    homepage = "http://www.postfix.org/";
+    description = "A fast, easy to administer, and secure mail server";
+    license = stdenv.lib.licenses.bsdOriginal;
+    platforms = stdenv.lib.platforms.linux;
+    maintainers = [ stdenv.lib.maintainers.rickynils ];
+  };
+
+}
diff --git a/pkgs/servers/mail/postfix/3.0.nix b/pkgs/servers/mail/postfix/3.0.nix
new file mode 100644
index 00000000000..52327090e44
--- /dev/null
+++ b/pkgs/servers/mail/postfix/3.0.nix
@@ -0,0 +1,91 @@
+{ stdenv, lib, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl
+, coreutils, findutils, gnugrep, gawk, icu, pcre
+, withPgSQL ? false, postgresql
+, withMySQL ? false, libmysql
+, withSQLite ? false, sqlite
+}:
+
+let
+  ccargs = lib.concatStringsSep " " ([
+    "-DUSE_TLS" "-DUSE_SASL_AUTH" "-DUSE_CYRUS_SASL" "-I${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:${gnused}/bin
+  '';
+
+  meta = {
+    homepage = "http://www.postfix.org/";
+    description = "A fast, easy to administer, and secure mail server";
+    license = lib.licenses.bsdOriginal;
+    platforms = lib.platforms.linux;
+    maintainers = [ lib.maintainers.rickynils ];
+  };
+
+}
diff --git a/pkgs/servers/mail/postfix/db-linux3.patch b/pkgs/servers/mail/postfix/db-linux3.patch
new file mode 100644
index 00000000000..c9dd4646798
--- /dev/null
+++ b/pkgs/servers/mail/postfix/db-linux3.patch
@@ -0,0 +1,39 @@
+diff --git a/makedefs b/makedefs
+index b8b98c8..94443c0 100644
+--- a/makedefs
++++ b/makedefs
+@@ -341,20 +341,20 @@ EOF
+ 		esac
+ 		;;
+     Linux.3*)	SYSTYPE=LINUX3
+-		if [ -f /usr/include/db.h ]
+-		then
+-		    : we are all set
+-		elif [ -f /usr/include/db/db.h ]
+-		then
+-		    CCARGS="$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 52327090e44..838ca7a8d8d 100644
--- a/pkgs/servers/mail/postfix/default.nix
+++ b/pkgs/servers/mail/postfix/default.nix
@@ -1,91 +1,70 @@
-{ stdenv, lib, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl
-, coreutils, findutils, gnugrep, gawk, icu, pcre
-, withPgSQL ? false, postgresql
-, withMySQL ? false, libmysql
-, withSQLite ? false, sqlite
+{ stdenv, fetchurl, db, glibc, openssl, cyrus_sasl
+, coreutils, findutils, gnused, gnugrep, bison, perl
 }:
 
-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");
+assert stdenv.isLinux;
 
-in stdenv.mkDerivation rec {
-
-  name = "postfix-${version}";
-
-  version = "3.0.3";
+stdenv.mkDerivation rec {
+  name = "postfix-2.8.12";
 
   src = fetchurl {
     url = "ftp://ftp.cs.uu.nl/mirror/postfix/postfix-release/official/${name}.tar.gz";
-    sha256 = "00mc12k5p1zlrlqcf33vh5zizaqr5ai8q78dwv69smjh6kn4c7j0";
+    sha256 = "11z07mjy53l1fnl7k4101yk4ilibgqr1164628mqcbmmr8bh2szl";
   };
 
-  buildInputs = [ makeWrapper gnused db openssl cyrus_sasl icu pcre ]
-                ++ lib.optional withPgSQL postgresql
-                ++ lib.optional withMySQL libmysql
-                ++ lib.optional withSQLite sqlite;
+  buildInputs = [db openssl cyrus_sasl bison perl];
 
   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 = ''
-    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 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='${ccargs}' AUXLIBS='${auxlibs}'
+    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'
   '';
 
-  installTargets = [ "non-interactive-package" ];
+  installPhase = ''
+    sed -e '/^PATH=/d' -i postfix-install
+    $SHELL postfix-install install_root=out -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:${gnused}/bin
+    mv -v "out$out/"* $out/
+
+    mkdir -p $out/share/postfix
+    mv conf $out/share/postfix/
+    mv LICENSE TLS_LICENSE $out/share/postfix/
+
+    sed -e 's@^PATH=.*@PATH=${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}
   '';
 
+  inherit glibc;
+
   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 ];
+    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 ];
   };
-
 }
diff --git a/pkgs/servers/mail/postfix/postfix-2.11.0.patch b/pkgs/servers/mail/postfix/postfix-2.11.0.patch
new file mode 100644
index 00000000000..cdc4521c428
--- /dev/null
+++ b/pkgs/servers/mail/postfix/postfix-2.11.0.patch
@@ -0,0 +1,76 @@
+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
new file mode 100644
index 00000000000..65f55ffd8f0
--- /dev/null
+++ b/pkgs/servers/mail/postfix/postfix-2.2.9-db.patch
@@ -0,0 +1,40 @@
+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
new file mode 100644
index 00000000000..03dcaa87f23
--- /dev/null
+++ b/pkgs/servers/mail/postfix/postfix-2.2.9-lib.patch
@@ -0,0 +1,12 @@
+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 4f089fd9dde..603e451116c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9709,7 +9709,10 @@ let
 
   popa3d = callPackage ../servers/mail/popa3d { };
 
-  postfix = callPackage ../servers/mail/postfix { };
+  postfix28 = callPackage ../servers/mail/postfix { };
+  postfix211 = callPackage ../servers/mail/postfix/2.11.nix { };
+  postfix30 = callPackage ../servers/mail/postfix/3.0.nix { };
+  postfix = postfix30;
 
   postsrsd = callPackage ../servers/mail/postsrsd { };