Create alias domain Qmail & Dovecot
 1) Create alias domain table and insert alias domain
   a) # mysql -u root -p vpopmail
   b) MariaDB [vpopmail]> create table aliasdomains ( domain char(96) not null, alias char(96) not null);
   c) MariaDB [vpopmail]> insert into aliasdomains (domain,alias) values ('domain.com','domain.org');
 2) Change dovecot mysql password query
   password_query = SELECT CONCAT( pw_name ,'@', pw_domain ) AS user, \
     pw_passwd AS password, \
     pw_dir as userdb_home, \
     89 AS userdb_uid, \
     89 AS userdb_gid \
     FROM vpopmail vp \
     LEFT JOIN aliasdomains ad ON ad.alias = '%d' \
     WHERE  ( vp.pw_domain = ad.domain  OR vp.pw_domain = '%d') AND ( vp.pw_name = '%n' )
 3) Test Dovecot:
    doveadm auth test user@domain.com 'password'
    doveadm auth test user@domain.org 'password'
 4) Create domain alias for Qmail ( /var/qmail/users/assign )
   a) # /home/vpopmail/bin/vaddaliasdomain domain.com domain.org 
      # cat /var/qmail/users/assign
         +domainA.com-:domainA.com:89:89:/home/vpopmail/domains/domainA.com:-::
         +domain.com-:domain.com:89:89:/home/vpopmail/domains/domain.com:-::
         +domain.org-:whitehorsetc.com:89:89:/home/vpopmail/domains/domain.com:-:: (addition)