1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Net/IMAP/InterIMAP.pm b/lib/Net/IMAP/InterIMAP.pm
index 0405794..745e64f 100644
--- a/lib/Net/IMAP/InterIMAP.pm
+++ b/lib/Net/IMAP/InterIMAP.pm
@@ -2249,7 +2249,8 @@ sub _resp($$;$$$) {
             }
         }
     }
-    elsif (s/\A\+ //) {
+    elsif (s/\A\+// and ($_ eq '' or s/\A //)) {
+        # microsoft's IMAP server violates RFC 3501 by skipping the trailing ' ' for empty resp-text
         if (defined $callback and $cmd eq 'AUTHENTICATE') {
             my $x = $callback->($_);
             $self->_cmd_extend(\$x);