diff --git a/app/api/views/alias.py b/app/api/views/alias.py
index ab14de9a0..efe6f9dcb 100644
--- a/app/api/views/alias.py
+++ b/app/api/views/alias.py
@@ -20,10 +20,10 @@
     is_valid_email,
     generate_reply_email,
 )
-from app.utils import sanitize_email
 from app.extensions import db
 from app.log import LOG
 from app.models import Alias, Contact, Mailbox, AliasMailbox
+from app.utils import sanitize_email
 
 
 @api_bp.route("/aliases", methods=["GET", "POST"])
diff --git a/app/api/views/auth.py b/app/api/views/auth.py
index 8575c1730..fd6bc5889 100644
--- a/app/api/views/auth.py
+++ b/app/api/views/auth.py
@@ -17,10 +17,10 @@
     send_email,
     render,
 )
-from app.utils import sanitize_email
 from app.extensions import db, limiter
 from app.log import LOG
 from app.models import User, ApiKey, SocialAuth, AccountActivation
+from app.utils import sanitize_email
 
 
 @api_bp.route("/auth/login", methods=["POST"])
diff --git a/app/api/views/mailbox.py b/app/api/views/mailbox.py
index 316c8a963..68a46487a 100644
--- a/app/api/views/mailbox.py
+++ b/app/api/views/mailbox.py
@@ -12,9 +12,9 @@
     email_can_be_used_as_mailbox,
     is_valid_email,
 )
-from app.utils import sanitize_email
 from app.extensions import db
 from app.models import Mailbox
+from app.utils import sanitize_email
 
 
 def mailbox_to_dict(mailbox: Mailbox):
diff --git a/app/api/views/new_custom_alias.py b/app/api/views/new_custom_alias.py
index 762456a12..4a25d4392 100644
--- a/app/api/views/new_custom_alias.py
+++ b/app/api/views/new_custom_alias.py
@@ -7,6 +7,8 @@
 from app.api.serializer import (
     serialize_alias_info_v2,
     get_alias_info_v2,
+    serialize_alias_info,
+    get_alias_info,
 )
 from app.config import MAX_NB_EMAIL_FREE_PLAN, ALIAS_LIMIT
 from app.dashboard.views.custom_alias import verify_prefix_suffix, signer
@@ -25,6 +27,78 @@
 from app.utils import convert_to_id
 
 
+@api_bp.route("/alias/custom/new", methods=["POST"])
+@limiter.limit(ALIAS_LIMIT)
+@require_api_auth
+def new_custom_alias():
+    """
+    Currently used by Safari extension.
+    Create a new custom alias
+    Input:
+        alias_prefix, for ex "www_groupon_com"
+        alias_suffix, either .random_letters@simplelogin.co or @my-domain.com
+        optional "hostname" in args
+        optional "note"
+    Output:
+        201 if success
+        409 if the alias already exists
+
+    """
+    LOG.warning("/alias/custom/new is obsolete")
+    user: User = g.user
+    if not user.can_create_new_alias():
+        LOG.d("user %s cannot create any custom alias", user)
+        return (
+            jsonify(
+                error="You have reached the limitation of a free account with the maximum of "
+                f"{MAX_NB_EMAIL_FREE_PLAN} aliases, please upgrade your plan to create more aliases"
+            ),
+            400,
+        )
+
+    hostname = request.args.get("hostname")
+
+    data = request.get_json()
+    if not data:
+        return jsonify(error="request body cannot be empty"), 400
+
+    alias_prefix = data.get("alias_prefix", "").strip().lower().replace(" ", "")
+    alias_suffix = data.get("alias_suffix", "").strip().lower().replace(" ", "")
+    note = data.get("note")
+    alias_prefix = convert_to_id(alias_prefix)
+
+    if not verify_prefix_suffix(user, alias_prefix, alias_suffix):
+        return jsonify(error="wrong alias prefix or suffix"), 400
+
+    full_alias = alias_prefix + alias_suffix
+    if (
+        Alias.get_by(email=full_alias)
+        or DeletedAlias.get_by(email=full_alias)
+        or DomainDeletedAlias.get_by(email=full_alias)
+    ):
+        LOG.d("full alias already used %s", full_alias)
+        return jsonify(error=f"alias {full_alias} already exists"), 409
+
+    alias = Alias.create(
+        user_id=user.id, email=full_alias, mailbox_id=user.default_mailbox_id, note=note
+    )
+
+    if alias_suffix.startswith("@"):
+        alias_domain = alias_suffix[1:]
+        domain = CustomDomain.get_by(domain=alias_domain)
+        if domain:
+            LOG.d("set alias %s to domain %s", full_alias, domain)
+            alias.custom_domain_id = domain.id
+
+    db.session.commit()
+
+    if hostname:
+        AliasUsedOn.create(alias_id=alias.id, hostname=hostname, user_id=alias.user_id)
+        db.session.commit()
+
+    return jsonify(alias=full_alias, **serialize_alias_info(get_alias_info(alias))), 201
+
+
 @api_bp.route("/v2/alias/custom/new", methods=["POST"])
 @limiter.limit(ALIAS_LIMIT)
 @require_api_auth
diff --git a/tests/api/test_new_custom_alias.py b/tests/api/test_new_custom_alias.py
index 4d9e3fe84..e3b3f154a 100644
--- a/tests/api/test_new_custom_alias.py
+++ b/tests/api/test_new_custom_alias.py
@@ -9,6 +9,37 @@
 from tests.utils import login
 
 
+def test_v1(flask_client):
+    login(flask_client)
+
+    word = random_word()
+    suffix = f".{word}@{EMAIL_DOMAIN}"
+
+    r = flask_client.post(
+        "/api/alias/custom/new",
+        json={
+            "alias_prefix": "prefix",
+            "alias_suffix": suffix,
+        },
+    )
+
+    assert r.status_code == 201
+    assert r.json["alias"] == f"prefix.{word}@{EMAIL_DOMAIN}"
+
+    res = r.json
+    assert "id" in res
+    assert "email" in res
+    assert "creation_date" in res
+    assert "creation_timestamp" in res
+    assert "nb_forward" in res
+    assert "nb_block" in res
+    assert "nb_reply" in res
+    assert "enabled" in res
+
+    new_alias: Alias = Alias.get_by(email=r.json["alias"])
+    assert len(new_alias.mailboxes) == 1
+
+
 def test_v2(flask_client):
     login(flask_client)