diff -urN ../Mail-SpamAssassin-3.4.4.orig/lib/Mail/SpamAssassin/Plugin/FreeMail.pm ./lib/Mail/SpamAssassin/Plugin/FreeMail.pm
--- ../Mail-SpamAssassin-3.4.4.orig/lib/Mail/SpamAssassin/Plugin/FreeMail.pm	2020-01-25 04:50:47.000000000 +0200
+++ ./lib/Mail/SpamAssassin/Plugin/FreeMail.pm	2020-09-27 15:37:06.854931000 +0300
@@ -313,6 +313,8 @@
 sub _is_freemail {
     my ($self, $email, $pms) = @_;
 
+    $email =~ s/\s+$//;
+
     return 0 if $email eq '';
 
     if (defined $self->{freemail_whitelist}{$email}) {