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)