diff --git a/app/config.py b/app/config.py
index 0c34fde6..16bdc1eb 100644
--- a/app/config.py
+++ b/app/config.py
@@ -157,6 +157,9 @@ DISABLE_ALIAS_SUFFIX = "DISABLE_ALIAS_SUFFIX" in os.environ
 # the email address that receives all unsubscription request
 UNSUBSCRIBER = os.environ.get("UNSUBSCRIBER")
 
+# due to a typo, both UNSUBSCRIBER and OLD_UNSUBSCRIBER are supported
+OLD_UNSUBSCRIBER = os.environ.get("OLD_UNSUBSCRIBER")
+
 DKIM_SELECTOR = b"dkim"
 DKIM_PRIVATE_KEY = None
 
diff --git a/email_handler.py b/email_handler.py
index 93162b7b..7eedb1ae 100644
--- a/email_handler.py
+++ b/email_handler.py
@@ -86,6 +86,7 @@ from app.config import (
     TEMP_DIR,
     ALERT_HOTMAIL_COMPLAINT_TRANSACTIONAL,
     ALERT_HOTMAIL_COMPLAINT_REPLY_PHASE,
+    OLD_UNSUBSCRIBER,
 )
 from app.db import Session
 from app.email import status, headers
@@ -2015,7 +2016,7 @@ def handle(envelope: Envelope) -> str:
         return status.E203
 
     # unsubscribe request
-    if UNSUBSCRIBER and rcpt_tos == [UNSUBSCRIBER]:
+    if UNSUBSCRIBER and (rcpt_tos == [UNSUBSCRIBER] or rcpt_tos == [OLD_UNSUBSCRIBER]):
         LOG.d("Handle unsubscribe request from %s", mail_from)
         return handle_unsubscribe(envelope, msg)