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-rw-r--r--Net/SMTP.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/Net/SMTP.pm b/Net/SMTP.pm
index db5907b..4e95db9 100644
--- a/Net/SMTP.pm
+++ b/Net/SMTP.pm
@@ -290,7 +290,7 @@ sub mail {
 
       if (defined($v = delete $opt{Envelope})) {
         if (exists $esmtp->{DSN}) {
-          $v =~ s/([^\041-\176]|=|\+)/sprintf "+%02x", ord($1)/sge;
+          $v =~ s/([^\041-\176]|=|\+)/sprintf "+%02X", ord($1)/sge;
           $opts .= " ENVID=$v";
         }
         else {