diff --git a/app/models.py b/app/models.py
index e1d6c026..2b84adae 100644
--- a/app/models.py
+++ b/app/models.py
@@ -420,6 +420,11 @@ class GenEmail(db.Model, ModelMixin):
         db.ForeignKey("custom_domain.id", ondelete="cascade"), nullable=True
     )
 
+    # To know whether an alias is created "on the fly", i.e. via the custom domain catch-all feature
+    automatic_creation = db.Column(
+        db.Boolean, nullable=False, default=False, server_default="0"
+    )
+
     user = db.relationship(User)
 
     @classmethod
diff --git a/migrations/versions/2019_123018_01f808f15b2e_.py b/migrations/versions/2019_123018_01f808f15b2e_.py
new file mode 100644
index 00000000..c411a1a1
--- /dev/null
+++ b/migrations/versions/2019_123018_01f808f15b2e_.py
@@ -0,0 +1,29 @@
+"""empty message
+
+Revision ID: 01f808f15b2e
+Revises: 10ad2dbaeccf
+Create Date: 2019-12-30 18:47:17.726860
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '01f808f15b2e'
+down_revision = '10ad2dbaeccf'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('gen_email', sa.Column('automatic_creation', sa.Boolean(), server_default='0', nullable=False))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('gen_email', 'automatic_creation')
+    # ### end Alembic commands ###