diff --git a/bugzilla-1855962-non-html-mail.patch b/bugzilla-1855962-non-html-mail.patch
new file mode 100644
index 0000000..0fd0637
--- /dev/null
+++ b/bugzilla-1855962-non-html-mail.patch
@@ -0,0 +1,19 @@
+diff --git a/Bugzilla/BugMail.pm b/Bugzilla/BugMail.pm
+index 18795d735..2075a71e1 100644
+--- a/Bugzilla/BugMail.pm
++++ b/Bugzilla/BugMail.pm
+@@ -495,10 +495,10 @@ sub _generate_bugmail {
+   }
+ 
+   my $email = Bugzilla::MIME->new($msg_header);
+-  if (scalar(@parts) == 1) {
+-    $email->content_type_set($parts[0]->content_type);
+-  }
+-  else {
++
++  # If there's only one part, we don't need to set the overall content type
++  # because Email::MIME will automatically take it from that part (bug 1657496)
++  if (scalar(@parts) > 1) {
+     $email->content_type_set('multipart/alternative');
+ 
+     # Some mail clients need same encoding for each part, even empty ones.
diff --git a/bugzilla.spec b/bugzilla.spec
index 8883d4c..c885948 100644
--- a/bugzilla.spec
+++ b/bugzilla.spec
@@ -1,7 +1,3 @@
-# This package depends on automagic byte compilation
-# https://fedoraproject.org/wiki/Changes/No_more_automagic_Python_bytecompilation_phase_2
-%global _python_bytecompile_extra 1
-
 %define bzinstallprefix %{_datadir}
 %define bzdatadir %{_sharedstatedir}/bugzilla
 
@@ -9,7 +5,7 @@ Summary: Bug tracking system
 URL: https://www.bugzilla.org/
 Name: bugzilla
 Version: 5.0.6
-Release: 3%{?dist}
+Release: 5%{?dist}
 License: MPLv1.1
 Source0: https://github.com/bugzilla/bugzilla/archive/release-%{version}.tar.gz
 Source1: bugzilla-httpd-conf
@@ -18,6 +14,8 @@ Source3: bugzilla.cron-daily
 Patch0: bugzilla-rw-paths.patch
 Patch1: bugzilla-dnf.patch
 Patch2: bugzilla-1438957-concatenate-assets.patch
+# https://bug1657496.bmoattachments.org/attachment.cgi?id=9169528
+Patch3: bugzilla-1855962-non-html-mail.patch
 
 BuildArch: noarch
 Requires: patchutils
@@ -164,13 +162,14 @@ Contributed scripts and functions for Bugzilla
 %patch0 -p1
 %patch1 -p1
 %patch2 -p1
+%patch3 -p1
 
 # Deal with changing /usr/local paths here instead of via patches
-%{__perl} -pi -e 's|/usr/local/bin/python\b|%{__python3}|' contrib/*.py
-%{__perl} -pi -e 's|/usr/bin/env python|%{__python3}|' contrib/bugzilla-submit/bugzilla-submit
+/usr/bin/perl -pi -e 's|/usr/local/bin/python\b|%{__python3}|' contrib/*.py
+/usr/bin/rm -rf contrib/bugzilla-submit
 
 grep -rl '/usr/lib/sendmail\b' contrib docs \
-| xargs %{__perl} -pi -e 's|/usr/lib/sendmail\b|%{_sbindir}/sendmail|'
+| xargs /usr/bin/perl -pi -e 's|/usr/lib/sendmail\b|%{_sbindir}/sendmail|'
 
 %build
 # Build docs
@@ -260,7 +259,6 @@ popd > /dev/null)
 %defattr(-,root,apache,-)
 %{bzinstallprefix}/bugzilla/contrib/bugzilla-queue.rhel
 %{bzinstallprefix}/bugzilla/contrib/bugzilla-queue.suse
-%{bzinstallprefix}/bugzilla/contrib/bugzilla-submit
 %{bzinstallprefix}/bugzilla/contrib/bzdbcopy.pl
 %{bzinstallprefix}/bugzilla/contrib/bz_webservice_demo.pl
 %{bzinstallprefix}/bugzilla/contrib/cmdline
@@ -280,6 +278,14 @@ popd > /dev/null)
 %{bzinstallprefix}/bugzilla/contrib/Bugzilla.pm
 
 %changelog
+* Mon Oct 19 2020 Emmanuel Seyman <emmanuel@seyman.fr> - 5.0.6-5
+- Replace calls to %%{__perl} with /usr/bin/perl
+- Remove contrib/bugzilla-submit (no longers works) (#1835451)
+
+* Tue Sep 29 2020 Emmanuel Seyman <emmanuel@seyman.fr> - 5.0.6-4
+- Remove automagic Python bytecompilation macro
+- Include upstream patch for text mails (#1855962)
+
 * Wed Jul 24 2019 Fedora Release Engineering <releng@fedoraproject.org> - 5.0.6-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild