diff --git a/README.md b/README.md
index a80af265..c37709f6 100644
--- a/README.md
+++ b/README.md
@@ -964,6 +964,7 @@ If success, 200 with the list of aliases. Each alias has the following fields:
 - nb_block
 - nb_forward
 - nb_reply
+- support_pgp: whether an alias can support PGP, i.e. when one of alias's mailboxes supports PGP.
 - mailbox: obsolete, should use `mailboxes` instead.
     - id
     - email
diff --git a/app/api/serializer.py b/app/api/serializer.py
index 8c2f85f9..635c157d 100644
--- a/app/api/serializer.py
+++ b/app/api/serializer.py
@@ -62,6 +62,7 @@ def serialize_alias_info_v2(alias_info: AliasInfo) -> dict:
             {"id": mailbox.id, "email": mailbox.email}
             for mailbox in alias_info.mailboxes
         ],
+        "support_pgp": alias_info.alias.mailbox_support_pgp()
     }
     if alias_info.latest_email_log:
         email_log = alias_info.latest_email_log
diff --git a/app/api/views/alias.py b/app/api/views/alias.py
index a21fbc61..3b0f96d4 100644
--- a/app/api/views/alias.py
+++ b/app/api/views/alias.py
@@ -84,6 +84,7 @@ def get_aliases_v2():
             - note
             - mailbox
             - mailboxes
+            - support_pgp
             - (optional) latest_activity:
                 - timestamp
                 - action: forward|reply|block|bounced
diff --git a/tests/api/test_alias.py b/tests/api/test_alias.py
index 923213c2..6c98d702 100644
--- a/tests/api/test_alias.py
+++ b/tests/api/test_alias.py
@@ -187,6 +187,9 @@ def test_get_aliases_v2(flask_client):
         assert "id" in mailbox
         assert "email" in mailbox
 
+    assert "support_pgp" in r0
+    assert not r0["support_pgp"]
+
 
 def test_delete_alias(flask_client):
     user = User.create(