Test that PostfixLogLine.create_from_line also attaches log lines to the Delivery model
Test that two log lines for different destinations get attached to the correct delivery
Add warning message if to address is not recognised
Only log the lines if to address matches
Just a little bit more test coverage
Log lines are now directly attached to deliveries
Simplify logic
Migrate the data as well
Log lines are no longer directly attached to emails
Temporarily put association back
Add an index