diff --git a/docs/notif/mail.md b/docs/notif/mail.md
index 4cad6389..539be533 100644
--- a/docs/notif/mail.md
+++ b/docs/notif/mail.md
@@ -22,6 +22,7 @@ Notifications can be sent through SMTP.
 | `port`[^1]            | `25`          | SMTP server port |
 | `ssl`                 | `false`       | SSL defines whether an SSL connection is used. Should be false in most cases since the auth mechanism should use STARTTLS |
 | `insecureSkipVerify`  | `false`       | Controls whether a client verifies the server's certificate chain and hostname |
+| `localName`           | `localhost`   | Hostname sent to the SMTP server with the HELO command |
 | `username`            |               | SMTP username |
 | `usernameFile`        |               | Use content of secret file as SMTP username if `username` not defined |
 | `password`            |               | SMTP password |
@@ -34,6 +35,7 @@ Notifications can be sent through SMTP.
     * `DIUN_NOTIF_MAIL_PORT`
     * `DIUN_NOTIF_MAIL_SSL`
     * `DIUN_NOTIF_MAIL_INSECURESKIPVERIFY`
+    * `DIUN_NOTIF_MAIL_LOCALNAME`
     * `DIUN_NOTIF_MAIL_USERNAME`
     * `DIUN_NOTIF_MAIL_USERNAMEFILE`
     * `DIUN_NOTIF_MAIL_PASSWORD`
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 6c91dbb4..3fa7aa4a 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -75,6 +75,7 @@ func TestLoadFile(t *testing.T) {
 						Port:               25,
 						SSL:                utl.NewFalse(),
 						InsecureSkipVerify: utl.NewFalse(),
+						LocalName:          "localhost",
 						From:               "diun@example.com",
 						To:                 "webmaster@example.com",
 					},
@@ -371,6 +372,7 @@ func TestLoadMixed(t *testing.T) {
 						Port:               25,
 						SSL:                utl.NewFalse(),
 						InsecureSkipVerify: utl.NewTrue(),
+						LocalName:          "localhost",
 						From:               "diun@foo.com",
 						To:                 "webmaster@foo.com",
 					},
diff --git a/internal/model/notif_mail.go b/internal/model/notif_mail.go
index 55acc3af..72e61803 100644
--- a/internal/model/notif_mail.go
+++ b/internal/model/notif_mail.go
@@ -10,6 +10,7 @@ type NotifMail struct {
 	Port               int    `yaml:"port,omitempty" json:"port,omitempty" validate:"required,min=1"`
 	SSL                *bool  `yaml:"ssl,omitempty" json:"ssl,omitempty" validate:"required"`
 	InsecureSkipVerify *bool  `yaml:"insecureSkipVerify,omitempty" json:"insecureSkipVerify,omitempty" validate:"required"`
+	LocalName          string `yaml:"localName,omitempty" json:"localName,omitempty" validate:"omitempty"`
 	Username           string `yaml:"username,omitempty" json:"username,omitempty" validate:"omitempty"`
 	UsernameFile       string `yaml:"usernameFile,omitempty" json:"usernameFile,omitempty" validate:"omitempty,file"`
 	Password           string `yaml:"password,omitempty" json:"password,omitempty" validate:"omitempty"`
@@ -31,4 +32,5 @@ func (s *NotifMail) SetDefaults() {
 	s.Port = 25
 	s.SSL = utl.NewFalse()
 	s.InsecureSkipVerify = utl.NewFalse()
+	s.LocalName = "localhost"
 }