If you add: # Replace example.com with one or more appropriate domains: domain = example.comto the table definition, all the lookup keys will be user@domain, with nobare domain or parent domain keys.
The manual says:"It is best not to use SQL to store the domains eligible for SQL lookups."
What is the negative side effect of doing so?How is it different than using virtual_mailbox_domains = mysql:/filename ? Or is using mysql: with virtual_mailbox_domains something also not recommended?