diff --git a/roles/postfix/defaults/main/restrictions.yml b/roles/postfix/defaults/main/restrictions.yml
index c709be2..614f2c9 100644
--- a/roles/postfix/defaults/main/restrictions.yml
+++ b/roles/postfix/defaults/main/restrictions.yml
@@ -1,6 +1,7 @@
 ---
 
 postfix_message_size_limit: 10240000
+postfix_mailbox_size_limit: 51200000
 
 postfix_smtpd_relay_restrictions:
   - permit_mynetworks
diff --git a/roles/postfix/templates/etc/postfix/main.cf.j2 b/roles/postfix/templates/etc/postfix/main.cf.j2
index 8a92426..1576b3e 100644
--- a/roles/postfix/templates/etc/postfix/main.cf.j2
+++ b/roles/postfix/templates/etc/postfix/main.cf.j2
@@ -96,6 +96,7 @@ smtp_tls_session_cache_database = {{ postfix_smtp_tls_session_cache_database }}
 disable_vrfy_command = yes
 
 message_size_limit = {{ postfix_message_size_limit }}
+mailbox_size_limit = {{ postfix_mailbox_size_limit }}
 
 smtpd_sender_login_maps =
 {% for restriction in postfix_smtpd_sender_login_maps %}