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-rw-r--r--lib/PublicInbox/POP3.pm3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/PublicInbox/POP3.pm b/lib/PublicInbox/POP3.pm
index 86123563..51c2b71a 100644
--- a/lib/PublicInbox/POP3.pm
+++ b/lib/PublicInbox/POP3.pm
@@ -176,7 +176,7 @@ sub _login_ok ($) {
                 $self->{uid_max} = $self->{ibx}->over(1)->max;
                 \"+OK logged in\r\n";
         } else {
-                \"-ERR unable to lock maildrop\r\n";
+                \"-ERR [IN-USE] unable to lock maildrop\r\n";
         }
 }
 
@@ -350,6 +350,7 @@ USER\r
 PIPELINING\r
 UIDL\r
 EXPIRE 0\r
+RESP-CODES\r
 .\r
 EOM
 }