diff --git a/data/conf/dovecot/dovecot.conf b/data/conf/dovecot/dovecot.conf
index 9f45b5ac..fecc2528 100644
--- a/data/conf/dovecot/dovecot.conf
+++ b/data/conf/dovecot/dovecot.conf
@@ -231,4 +231,5 @@ dict {
 remote 127.0.0.1 {
   disable_plaintext_auth = no
 }
+submission_host = postfix:588
 mail_max_userip_connections = 500
diff --git a/data/conf/postfix/main.cf b/data/conf/postfix/main.cf
index e90de183..054adfef 100644
--- a/data/conf/postfix/main.cf
+++ b/data/conf/postfix/main.cf
@@ -9,7 +9,7 @@ smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_una
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 relayhost =
-mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.22.1.0/24
 mailbox_size_limit = 0
 recipient_delimiter = +
 inet_interfaces = all