diff --git a/README.md b/README.md
index 0408fd9..a9c03ca 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ On local PC (192.168.1.54) create file `/etc/mailrelay.json` with contents:
     "smtp_password": "secretAppPassword",
     "smtp_max_email_size": 10485760,
     "smtp_login_auth_type": false,
+    "smtp_helo": "smtp.example.com",
     "local_listen_ip": "0.0.0.0",
     "local_listen_port": 2525,
     "allowed_hosts": ["*"],
diff --git a/main.go b/main.go
index d2939a6..893a93d 100644
--- a/main.go
+++ b/main.go
@@ -30,6 +30,7 @@ type mailRelayConfig struct {
 	SMTPLoginAuthType bool     `json:"smtp_login_auth_type"`
 	SMTPUsername      string   `json:"smtp_username"`
 	SMTPPassword      string   `json:"smtp_password"`
+	SMTPHelo          string   `json:"smtp_helo"`
 	SkipCertVerify    bool     `json:"smtp_skip_cert_verify"`
 	MaxEmailSize      int64    `json:"smtp_max_email_size"`
 	LocalListenIP     string   `json:"local_listen_ip"`
diff --git a/server.go b/server.go
index 96bc218..891156e 100644
--- a/server.go
+++ b/server.go
@@ -47,6 +47,7 @@ func Start(appConfig *mailRelayConfig, verbose bool) (err error) {
 		"smtp_starttls":         appConfig.SMTPStartTLS,
 		"smtp_login_auth_type":  appConfig.SMTPLoginAuthType,
 		"smtp_skip_cert_verify": appConfig.SkipCertVerify,
+		"smtp_helo":             appConfig.SMTPHelo,
 	}
 	cfg.BackendConfig = bcfg