diff --git a/core/config/dovecot.master b/core/config/dovecot.master
index 2890241..da3879d 100644
--- a/core/config/dovecot.master
+++ b/core/config/dovecot.master
@@ -1,3 +1,5 @@
+listen = "[::]"
+
 service imap-login {
   inet_listener imap {
 
diff --git a/core/config/postfix.main.cf b/core/config/postfix.main.cf
index e252c1f..71cf2bb 100644
--- a/core/config/postfix.main.cf
+++ b/core/config/postfix.main.cf
@@ -5,6 +5,8 @@
 # is /etc/mailname.
 #myorigin = /etc/mailname
 
+inet_protocols=ipv6
+
 smtpd_banner = $myhostname ESMTP $mail_name
 biff = no