Disabe mail-in-a-box SPAM. Making all emails go to the inbox.

miab-forward-all-spam.txt

- Modify the SpamAssassin file
$ nano /etc/spamassassin/local.cf

- Add all domains as whitelisted from SpamAssassin, anywhere on the file
whitelist_from *@*

- Disable postgrey by creating a new .local file with whitelists and whitelisting every domain
$ nano /etc/postgrey/whitelist_clients.local

- Anywhere on the file
/.*/

- You may also try to modify the MIAB managed whitelisted clients, without the ".local" and the end. Though, you are in risk of it being overwritten by a MIAB upgrade.

- Disable Postfix sender address verification
$ nano /etc/postfix/main.cf

- Find the line with "smtpd_sender_restrictions" and remove all restrictions, leaving it as
smtpd_sender_restrictions=

- Restart all processes
$ sudo service spamassassin restart
$ sudo service spampd restart
$ sudo service postfix restart

- (OPTIONAL) Increase redirects to be more than 4 at a time
$ nano /etc/dovecot/conf.d/90-sieve.conf

- (OPTIONAL) Uncomment and modify the following line
sieve_max_redirects = 12

- (OPTIONAL) Restart dovecot
$ sudo service dovecot restart