diff --git a/modules/kubernetes/mailserver/variables.tf b/modules/kubernetes/mailserver/variables.tf
index 6eff128b..a4e38206 100644
--- a/modules/kubernetes/mailserver/variables.tf
+++ b/modules/kubernetes/mailserver/variables.tf
@@ -105,7 +105,7 @@ smtp_header_checks = pcre:/etc/postfix/maps/sender_header_filter.pcre
 myhostname = mail.viktorbarzin.me
 mydomain = viktorbarzin.me
 smtputf8_enable = no
-message_size_limit = 10240000
+message_size_limit = 20480000
 sender_canonical_maps = tcp:localhost:10001
 sender_canonical_classes = envelope_sender
 recipient_canonical_maps = tcp:localhost:10002