Mail::Box::Manager, Mail::Sendmail and Compress::Zlib is only needed for

podebconf-report, if program needs the perl module and it is not installed,
  it will send a warning, so these perl modules are optional.

po-debconf.spec

@@ -14,7 +14,7 @@
 
 Name:		po-debconf
 Version:	1.0.21
-Release:	8%{release_posttag}%{?dist}
+Release:	9%{release_posttag}%{?dist}
 Summary:	Tool for managing templates file translations with gettext
 
 License:	GPLv2+
@@ -42,9 +42,15 @@ Requires:	intltool
 Requires:	gettext
 
 # Debian optional run-time features
+%if 0%{?rhel} && 0%{?rhel} <= 7
 Requires:	perl(Compress::Zlib)
 Requires:	perl(Mail::Sendmail)
 Requires:	perl(Mail::Box::Manager)
+%else
+Recommends:	perl(Compress::Zlib)
+Recommends:	perl(Mail::Sendmail)
+Recommends:	perl(Mail::Box::Manager)
+%endif
 
 
 %description
@@ -112,6 +118,11 @@ ln -s ../bin %{buildroot}%{_datadir}/intltool-debian
 %{_datadir}/intltool-debian
 
 %changelog
+* Sat Jul 02 2022 Sérgio Basto <sergio@serjux.com> - 1.0.21-9.nmu1
+- Mail::Box::Manager, Mail::Sendmail and Compress::Zlib is only needed for
+  podebconf-report, if program needs the perl module and it is not installed,
+  it will send a warning, so these perl modules are optional.
+
 * Fri Jan 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 1.0.21-8.nmu1
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild