I'm setting up a mailserver, following Linode's "Email with Postfix" instructions. When I get to the point of of testing whether my email alias is present in mysql-virtual-mailbox-maps.cf, I get this rather contradictory message:

postmap: warning: connect to mysql server 127.0.0.1: Access denied for user 'mailuser'@'localhost' (using password: YES)
postmap: fatal: table mysql:/etc/postfix/mysql-virtual-alias-maps.cf: query error: Success

Does this indicate success or failure? The access denied message points to 'mailuser'@'localhost'. Should 'mailuser' be replaced by something else (such as the actual username)?

Thanks for any help.

Any user name should be ok (including "mailuser") as long as the pair user/password created to access the mysql database and the pair user/password you tell postfix and dovecot to use in the config files are the same.

Hello,

Check your password for mailuser again in the the file /etc/postfix/mysql-virtual-alias-maps.cf