Add Contact.invalid_email column

app/models.py

@@ -1179,6 +1179,11 @@ class Contact(db.Model, ModelMixin):
     # the message["From"] header
     from_header = db.Column(db.Text, nullable=True, default=None)
 
+    # a contact can have an empty email address, in this case it can't receive emails
+    invalid_email = db.Column(
+        db.Boolean, nullable=False, default=False, server_default="0"
+    )
+
     @property
     def email(self):
         return self.website_email

migrations/versions/2020_111415_9dc16e591f88_.py

@@ -0,0 +1,29 @@
+"""empty message
+
+Revision ID: 9dc16e591f88
+Revises: d0f197979bd9
+Create Date: 2020-11-14 15:53:38.354575
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '9dc16e591f88'
+down_revision = 'd0f197979bd9'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('contact', sa.Column('invalid_email', sa.Boolean(), server_default='0', nullable=False))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('contact', 'invalid_email')
+    # ### end Alembic commands ###