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The fact one user is working, but the others are not suggests a problem with authentication. My guess, and it is purely a guess, is that when you created the secondary user, something got set differently, such as a hashing on the password or the account was created as user rather than user@domain.
In order to solve this problem, you will need to delve into the logs. Since this is a postfix + dovecot system you can look in your mail.log for additional information. You may need to turn on password debugging in Dovecot, which can be done through the dovecot configuration files in /etc.
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