add email_log.mailbox_id column

app/models.py

@@ -1335,6 +1335,12 @@ class EmailLog(db.Model, ModelMixin):
         db.ForeignKey("refused_email.id", ondelete="SET NULL"), nullable=True
     )
 
+    # in forward phase, this is the mailbox that will receive the email
+    # in reply phase, this is the mailbox (or a mailbox's authorized address) that sends the email
+    mailbox_id = db.Column(
+        db.ForeignKey("mailbox.id", ondelete="cascade"), nullable=True
+    )
+
     # in case of bounce, record on what mailbox the email has been bounced
     # useful when an alias has several mailboxes
     bounced_mailbox_id = db.Column(

migrations/versions/2020_112416_623662ea0e7e_.py

@@ -0,0 +1,31 @@
+"""empty message
+
+Revision ID: 623662ea0e7e
+Revises: d1edb3cadec8
+Create Date: 2020-11-24 16:34:02.327556
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '623662ea0e7e'
+down_revision = 'd1edb3cadec8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('email_log', sa.Column('mailbox_id', sa.Integer(), nullable=True))
+    op.create_foreign_key(None, 'email_log', 'mailbox', ['mailbox_id'], ['id'], ondelete='cascade')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'email_log', type_='foreignkey')
+    op.drop_column('email_log', 'mailbox_id')
+    # ### end Alembic commands ###