diff --git a/pkgs/servers/monitoring/prometheus/mail-exporter.nix b/pkgs/servers/monitoring/prometheus/mail-exporter.nix
index bb8f8526a319..95908e8b6a55 100644
--- a/pkgs/servers/monitoring/prometheus/mail-exporter.nix
+++ b/pkgs/servers/monitoring/prometheus/mail-exporter.nix
@@ -1,19 +1,17 @@
-{ stdenv, buildGoPackage, fetchFromGitHub, installShellFiles, nixosTests }:
+{ stdenv, buildGoModule, fetchFromGitHub, installShellFiles, nixosTests }:
 
-buildGoPackage {
+buildGoModule {
   pname = "mailexporter";
-  version = "2019-07-14";
-
-  goPackagePath = "github.com/cherti/mailexporter";
+  version = "2020-07-16";
 
   src = fetchFromGitHub {
-    rev = "c60d1970abbedb15e70d6fc858f7fd76fa061ffe";
     owner = "cherti";
     repo = "mailexporter";
-    sha256 = "0wlw7jvmhgvg1r2bsifxm2d0vj0iqhplnx6n446625sslvddx3vn";
+    rev = "f5a552c736ac40ccdc0110d2e9a71619c1cd6862";
+    sha256 = "0y7sg9qrd7q6g5gi65sjvw6byfmk2ph0a281wjc9cr4pd25xkciz";
   };
 
-  goDeps = ./mail-exporter_deps.nix;
+  vendorSha256 = "1hwahk8v3qnmyn6bwk9l2zpr0k7p2w7zjzxmjwgjyx429g9rzqs0";
 
   nativeBuildInputs = [ installShellFiles ];
 
diff --git a/pkgs/servers/monitoring/prometheus/mail-exporter_deps.nix b/pkgs/servers/monitoring/prometheus/mail-exporter_deps.nix
deleted file mode 100644
index 221f179940bc..000000000000
--- a/pkgs/servers/monitoring/prometheus/mail-exporter_deps.nix
+++ /dev/null
@@ -1,92 +0,0 @@
-[
-  {
-    goPackagePath = "github.com/beorn7/perks";
-    fetch = {
-      type = "git";
-      url = "https://github.com/beorn7/perks";
-      rev = "4b2b341e8d7715fae06375aa633dbb6e91b3fb46";
-      sha256 = "1i1nz1f6g55xi2y3aiaz5kqfgvknarbfl4f0sx4nyyb4s7xb1z9x";
-    };
-  }
-  {
-    goPackagePath = "github.com/golang/protobuf";
-    fetch = {
-      type = "git";
-      url = "https://github.com/golang/protobuf";
-      rev = "6c65a5562fc06764971b7c5d05c76c75e84bdbf7";
-      sha256 = "1k1wb4zr0qbwgpvz9q5ws9zhlal8hq7dmq62pwxxriksayl6hzym";
-    };
-  }
-  {
-    goPackagePath = "github.com/matttproud/golang_protobuf_extensions";
-    fetch = {
-      type = "git";
-      url = "https://github.com/matttproud/golang_protobuf_extensions";
-      rev = "c182affec369e30f25d3eb8cd8a478dee585ae7d";
-      sha256 = "1xqsf9vpcrd4hp95rl6kgmjvkv1df4aicfw4l5vfcxcwxknfx2xs";
-    };
-  }
-  {
-    goPackagePath = "github.com/prometheus/client_golang";
-    fetch = {
-      type = "git";
-      url = "https://github.com/prometheus/client_golang";
-      rev = "a6c69798cccecfd43070693e4416838767f73e18";
-      sha256 = "0s6xprvkdyfvmx4540454972fn3gvrzy7fyv0yq42h32nw3l7p75";
-    };
-  }
-  {
-    goPackagePath = "github.com/prometheus/client_model";
-    fetch = {
-      type = "git";
-      url = "https://github.com/prometheus/client_model";
-      rev = "fd36f4220a901265f90734c3183c5f0c91daa0b8";
-      sha256 = "1bs5d72k361llflgl94c22n0w53j30rsfh84smgk8mbjbcmjsaa5";
-    };
-  }
-  {
-    goPackagePath = "github.com/prometheus/common";
-    fetch = {
-      type = "git";
-      url = "https://github.com/prometheus/common";
-      rev = "31bed53e4047fd6c510e43a941f90cb31be0972a";
-      sha256 = "1q16br348117ffycxdwsldb0i39p34miclfa8z93k6vjwnrqbh2l";
-    };
-  }
-  {
-    goPackagePath = "github.com/prometheus/procfs";
-    fetch = {
-      type = "git";
-      url = "https://github.com/prometheus/procfs";
-      rev = "8f55e607908ea781ad9d08521730d73e047d9ac4";
-      sha256 = "023581b68mz89yhgnk4w08ch05ix60v0hv9jlqz65w43s4j7g4vb";
-    };
-  }
-  {
-    goPackagePath = "golang.org/x/sys";
-    fetch = {
-      type = "git";
-      url = "https://go.googlesource.com/sys";
-      rev = "04f50cda93cbb67f2afa353c52f342100e80e625";
-      sha256 = "0hmfsz9y1ingwsn482hlzzmzs7kr3cklm0ana0mbdk70isw2bxnw";
-    };
-  }
-  {
-    goPackagePath = "gopkg.in/fsnotify.v1";
-    fetch = {
-      type = "git";
-      url = "https://gopkg.in/fsnotify.v1";
-      rev = "c2828203cd70a50dcccfb2761f8b1f8ceef9a8e9";
-      sha256 = "07va9crci0ijlivbb7q57d2rz9h27zgn2fsm60spjsqpdbvyrx4g";
-    };
-  }
-  {
-    goPackagePath = "gopkg.in/yaml.v2";
-    fetch = {
-      type = "git";
-      url = "https://gopkg.in/yaml.v2";
-      rev = "51d6538a90f86fe93ac480b35f37b2be17fef232";
-      sha256 = "01wj12jzsdqlnidpyjssmj0r4yavlqy7dwrg7adqd8dicjc4ncsa";
-    };
-  }
-]