diff --git a/m-labs-intl/nginx.conf b/m-labs-intl/nginx.conf
index 4fd4ee0..621d6a9 100644
--- a/m-labs-intl/nginx.conf
+++ b/m-labs-intl/nginx.conf
@@ -67,30 +67,10 @@ stream {
         server mail.m-labs.hk:25;
     }
 
-    upstream pop3_backend {
-        server mail.m-labs.hk:110;
-    }
-
-    upstream imap_backend {
-        server mail.m-labs.hk:143;
-    }
-
-    upstream smtps_backend {
-        server mail.m-labs.hk:465;
-    }
-
     upstream submission_backend {
         server mail.m-labs.hk:587;
     }
 
-    upstream imaps_backend {
-        server mail.m-labs.hk:993;
-    }
-
-    upstream pop3s_backend {
-        server mail.m-labs.hk:995;
-    }
-
     # SMTP
     server {
         listen 25;
@@ -98,45 +78,10 @@ stream {
         proxy_protocol on;
     }
 
-    # POP3
-    server {
-        listen 110;
-        proxy_pass pop3_backend;
-        proxy_protocol on;
-    }
-
-    # IMAP
-    server {
-        listen 143;
-        proxy_pass imap_backend;
-        proxy_protocol on;
-    }
-
-    # SMTPS (Secure SMTP)
-    server {
-        listen 465;
-        proxy_pass smtps_backend;
-        proxy_protocol on;
-    }
-
     # Submission (Authenticated SMTP)
     server {
         listen 587;
         proxy_pass submission_backend;
         proxy_protocol on;
     }
-
-    # IMAPS (Secure IMAP)
-    server {
-        listen 993;
-        proxy_pass imaps_backend;
-        proxy_protocol on;
-    }
-
-    # POP3S (Secure POP3)
-    server {
-        listen 995;
-        proxy_pass pop3s_backend;
-        proxy_protocol on;
-    }
 }