Mailnames left overs

[timtrott]

When a domain has been delted or migrated it appears that mail files and mail names remain behind, causing "not accepting mail" errors when trying to send messages to addresses that have been moved.

Can the old /mailnames directories be removed safely?

Can the mailnames config file be edited safely or is it generated somewhere else?

Is there some PSA utility that can be used to generate a fresh mailnames config file to eliminate the problem?