The @localhost part is correct if you connecting to mysql at 127.0.0.1. It's the rdns of the connecting client.  Are you sure that the user postfix has access rights to postfix database? Can you connect on cli using something like mysql -upostfix -ppostfix postfix  ?

Am 28. November 2017 19:08:12 MEZ schrieb Spike98 <spike98@protonmail.com>:

I am trying to make a mail server with Postfix using the Dovecot software. At the time of wanting to access my server from a mail client, it does not let me access and see the logs of my server with the command:

$ service dovecot status with the following error:

dovecot: auth-worker(2769): Error: mysql(127.0.0.1): Connect failed to database (postfix): Access denied for user 'postfix'@'localhost' (using password: YES) - waiting for 125 seconds before retry

From what I understand of this error is that it is trying to enter 'postfix' @ 'localhost' instead of the domain that I specify when I made the database that is mydomain.com

How can you make dovecot go to MySQL with postfix@mydomain.com instead of localhost

This is my Dovecot configuration

/etc/dovecot/dovecot-sql.conf.ext

driver=mysql

default_pass_scheme=PLAIN-MD5

connect=host=127.0.0.1 dbname=postfix user=postfix password=postfix

password_query=SELECT username,domain,password FROM usuarios WHERE username='%n' AND domain='%d'

user_query=SELECT 1007 as uid, 1007 as gid, concat("maildir:/var/vmail",domain,'/',username,'/') as mail FROM usuarios WHERE username='%n' AND domain='%d'

iterate_query=SELECT username,domain FROM usuarios

-- Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.