diff -urN ../Mail-SpamAssassin-4.0.0.orig/lib/Mail/SpamAssassin/Plugin/FreeMail.pm ./lib/Mail/SpamAssassin/Plugin/FreeMail.pm
--- ../Mail-SpamAssassin-4.0.0.orig/lib/Mail/SpamAssassin/Plugin/FreeMail.pm	2022-12-14 08:03:20.000000000 +0200
+++ ./lib/Mail/SpamAssassin/Plugin/FreeMail.pm	2023-02-08 21:59:36.030156000 +0200
@@ -301,6 +301,8 @@
 sub _is_freemail {
     my ($self, $email, $pms) = @_;
 
+    $email =~ s/\s+$//;
+
     return 0 if $email eq '';
 
     if (defined $self->{freemail_welcomelist}{$email}) {