diff --git a/M%E1%BB%99t-s%E1%BB%91-log-l%E1%BB%97i-c%E1%BA%A7n-quan-t%C3%A2m.md b/M%E1%BB%99t-s%E1%BB%91-log-l%E1%BB%97i-c%E1%BA%A7n-quan-t%C3%A2m.md
index 1e8cb77..8576b04 100644
--- a/M%E1%BB%99t-s%E1%BB%91-log-l%E1%BB%97i-c%E1%BA%A7n-quan-t%C3%A2m.md
+++ b/M%E1%BB%99t-s%E1%BB%91-log-l%E1%BB%97i-c%E1%BA%A7n-quan-t%C3%A2m.md
@@ -21,5 +21,10 @@
 
 `550 5.7.1 Unfortunately, messages from [180.188.197.157] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [CO1NAM11FT019.eop-nam11.prod.protection.outlook.com]` => IP đã bị block. Requesst IP Block tại: https://support.microsoft.com/en-us/supportrequestform/
 
+
+## Lỗi không xác định
+``` 451 Temporary local problem - please try later
+
+```
 ## Bug
 `Invalid argument - connect(2) for "alt1.aspmx.l.google.com" port 25, Invalid argument - connect(2) for "aspmx.l.google.com" port 25, Invalid argument - connect(2) for "alt2.aspmx.l.google.com" port 25, Invalid argument - connect(2) for "aspmx2.googlemail.com" port 25, Invalid argument - connect(2) for "aspmx3.googlemail.com" port 25, Invalid argument - connect(2) for "aspmx4.googlemail.com" port 25, Invalid argument - connect(2) for "aspmx5.googlemail.com" port 25`
\ No newline at end of file