…
smtpd_sender_login_maps =
    ${db_driver}:/shared/modoboa/postfix/sql-sender-login-mailboxes.cf
    ${db_driver}:/shared/modoboa/postfix/sql-sender-login-aliases.cf
    ${db_driver}:/shared/modoboa/postfix/sql-sender-login-mailboxes-extra.cf

smtpd_sender_restrictions =
    permit_mynetworks
    reject_sender_login_mismatch
    permit
…
recipient_delimiter = -

# This file was generated on Jan. 7, 2018, 5:55 p.m. by running:
# manage.py generate_postfix_maps --destdir /shared/modoboa/postfix
# DO NOT EDIT!
user = modoboa
password = IMNOTTHATDUMB
dbname = modoboa
hosts = postgresql
query = SELECT email FROM core_user WHERE email='%s' AND is_active

# This file was generated on Jan. 7, 2018, 5:55 p.m. by running:
# manage.py generate_postfix_maps --destdir /shared/modoboa/postfix
# DO NOT EDIT!
user = modoboa
password = IMNOTTHATDUMB
dbname = modoboa
hosts = postgresql
query = SELECT mb.address || '@' || dom.name FROM admin_mailbox mb INNER JOIN modoboa_admin_aliasrecipient alr ON alr.r_mailbox_id=mb.id INNER JOIN admin_domain dom ON dom.id=mb.domain_id INNER JOIN admin_alias al ON alr.alias_id=al.id WHERE al.enabled AND al.address='%s'

# This file was generated on Jan. 7, 2018, 5:55 p.m. by running:
# manage.py generate_postfix_maps --destdir /shared/modoboa/postfix
# DO NOT EDIT!
user = modoboa
password = IMNOTTHATDUMB
dbname = modoboa
hosts = postgresql
query = SELECT mb.address || '@' || dom.name FROM admin_mailbox mb INNER JOIN admin_senderaddress sad ON sad.mailbox_id=mb.id INNER JOIN admin_domain dom ON dom.id=mb.domain_id WHERE sad.address='%s'

5.7.1 <john-bla@exmaple.com>: Sender address rejected: not owned by user john@exmaple.com.