diff --git a/roles/ispmail-postfix/tasks/main.yml b/roles/ispmail-postfix/tasks/main.yml
index 477f498..5e0740f 100644
--- a/roles/ispmail-postfix/tasks/main.yml
+++ b/roles/ispmail-postfix/tasks/main.yml
@@ -30,3 +30,13 @@
   - virtual-mailbox-maps
   - virtual-alias-maps
 
+- name: Define dovecot service in master.cf
+  shell: postconf -vM dovecot/unix='dovecot unix - n n - - pipe flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/dovecot-lda -f ${sender} -d ${recipient}'
+  notify: restart postfix
+
+- name: Set virtual_transport to dovecot
+  shell: postconf virtual_transport=dovecot
+
+- name: Restricting delivery to Dovecot to one email at a time
+  shell: postconf dovecot_destination_recipient_limit=1
+