diff --git a/rootfs/etc/confd/templates/main.cf.tmpl b/rootfs/etc/confd/templates/main.cf.tmpl
index 85e9ff5..529943e 100644
--- a/rootfs/etc/confd/templates/main.cf.tmpl
+++ b/rootfs/etc/confd/templates/main.cf.tmpl
@@ -14,6 +14,7 @@ recipient_delimiter = +
 mailbox_transport = lmtp:{{getenv "LMTP_HOST"}}
 mailbox_size_limit = {{getenv "MAILBOX_SIZELIMIT" "0"}}
 smtpd_banner = {{getenv "SMTP_BANNER"}} $myhostname ESMTP $mail_name
+smtp_helo_name = $mydomain
 
 virtual_mailbox_maps = pgsql:/etc/postfix/pgsql-virtual-mailbox-maps.cf
 virtual_mailbox_domains = pgsql:/etc/postfix/pgsql-virtual-mailbox-domains.cf