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Redhat10/Mail

1- Network	2- Postfix	3- Dovecot	4- Postfixadmin	5- PostfixMariaDB	6- DovecotMariaDB
7- RelaySmtp	8- Troubleshoot	9- Selinux	10- GnomeShell	11- Maintenance

5. Postfix-MariaDB.

5.1 Part Three (2/3).

Configure Postfix to use MySQL/MARIADB database.

5.2 Installation.

dnf install -y postfix-mysql

5.3 Configuration.

vi /etc/postfix/main.cf
Put the following at the end of the file.

virtual_mailbox_domains = proxy:mysql:/etc/postfix/sql/mysql_virtual_domains_maps.cf  
virtual_mailbox_maps =  
   proxy:mysql:/etc/postfix/sql/mysql_virtual_mailbox_maps.cf,  
   proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_domain_mailbox_maps.cf  
virtual_alias_maps =  
   proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_maps.cf,  
   proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_domain_maps.cf,  
   proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_domain_catchall_maps.cf  
  
virtual_transport = lmtp:unix:private/dovecot-lmtp  

Create the “sql” directory.
mkdir /etc/postfix/sql/
Create the following files.
vi /etc/postfix/sql/mysql_virtual_domains_maps.cf

user = postfixadmin  
password = D51mAB49!  
hosts = localhost  
dbname = postfixadmin  
query = SELECT domain FROM domain WHERE domain='%s' AND active = '1'  
#query = SELECT domain FROM domain WHERE domain='%s'  
#optional query to use when relaying for backup MX  
#query = SELECT domain FROM domain WHERE domain='%s' AND backupmx = '0' AND active = '1'  
#expansion_limit = 100  

vi /etc/postfix/sql/mysql_virtual_mailbox_maps.cf

user = postfixadmin  
password =  D51mAB49!  
hosts = localhost  
dbname = postfixadmin  
query = SELECT maildir FROM mailbox WHERE username='%s' AND active = '1'  
#expansion_limit = 100  

vi /etc/postfix/sql/mysql_virtual_alias_domain_mailbox_maps.cf

user = postfixadmin  
password = D51mAB49!  
hosts = localhost  
dbname = postfixadmin  
query = SELECT maildir FROM mailbox,alias_domain WHERE alias_domain.alias_domain = '%d' and mailbox.username = CONCAT('%u', '@', alias_domain.target_domain) AND mailbox.active = 1 AND alias_domain.active='1'  

vi /etc/postfix/sql/mysql_virtual_alias_maps.cf

user = postfixadmin  
password = D51mAB49!  
hosts = localhost  
dbname = postfixadmin  
query = SELECT goto FROM alias WHERE address='%s' AND active = '1'  
#expansion_limit = 100  

vi /etc/postfix/sql/mysql_virtual_alias_domain_maps.cf

user = postfixadmin  
password = D51mAB49!  
hosts = localhost  
dbname = postfixadmin  
query = SELECT goto FROM alias,alias_domain WHERE alias_domain.alias_domain = '%d' and alias.address = CONCAT('%u', '@', alias_domain.target_domain) AND alias.active = 1 AND alias_domain.active='1'  

vi /etc/postfix/sql/mysql_virtual_alias_domain_catchall_maps.cf

# handles catch-all settings of target-domain  
user = postfixadmin  
password = D51mAB49!  
hosts = localhost  
dbname = postfixadmin  
query = SELECT goto FROM alias,alias_domain WHERE alias_domain.alias_domain = '%d' and alias.address = CONCAT('@', alias_domain.target_domain) AND alias.active = 1 AND alias_domain.active='1'  

Allow read-only for root and postfix.
chmod 0640 /etc/postfix/sql/*
setfacl -R -m u:postfix:rx /etc/postfix/sql/

Use only virtual accounts and not local.
vi /etc/postfix/main.cf
Modify the line mydestination.

# See also below, section "REJECTING MAIL FOR UNKNOWN LOCAL USERS".  
#  
mydestination =  $myhostname, localhost.$mydomain, localhost  

And add at the end of the file.
vi /etc/postfix/main.cf

virtual_mailbox_base = /var/vmail  
virtual_minimum_uid = 2000  
virtual_uid_maps = static:2000  
virtual_gid_maps = static:2000  

systemctl restart postfix

5.4 Create a vmail user without home.

By default user UIDs and group GIDs are limited to 999.
vi /etc/login.defs
Modify the lines.

SYS_UID_MAX            2001  
SYS_GID_MAX            2001  

adduser vmail --system --uid 2000 --user-group --no-create-home
cat /etc/passwd| grep vmail

vmail:x:2000:2000::/home/vmail:/bin/bash  

mkdir /var/vmail/
chown -R vmail:vmail /var/vmail/