postfix postmap: fatal: open database /etc/postfix/sasl_passwd.db: Permission denied

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You need to make sure that postfix user is able to read that file. You can post the output of $ sudo ls -l /etc/postfix/sasl_passwd.db to get more help.
To create this file, you can use the command:
$ sudo postmap sasl_passwd
This will create the .db file.

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