database relay_domains.db is older than source file relay_domains
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There is a reference to the error in the OP, but it is far from central to the thread.
Now you are being a trool. 5k post in only two years you have no life. I did not just start using Linux. Many users will not read the manuals and do not try google. I obviously did something correctly because my postfix install works correctly.
Have look at the alias file for a start, but the alias file maps nonexistent "users" to real users (for example postmaster to you) or unused mail accounts to used ones (such as root to you) or can even map one "user" to several.
Postfix can use normal text files, but they aren't as efficient as the database files that newaliases creates, so database files are generally used. Running newaliases creates aliases.db from aliases.