API: Email (SMTP)

Function for sending email via an SMTP server.

C++ registration: regEmail(js). Implementation: jsEmail.h.

send_email

send_email(config: object) → object

Send an email via SMTP.

Parameters (fields of the config object):

Field	Type	Required	Description
`host`	string	✓	SMTP server
`port`	number	✓	Port (25, 465, 587)
`user`	string	✓	SMTP authentication login
`pass`	string	✓	Password
`ssl`	bool	—	`true` — SMTPS (SSL from the first byte, usually port 465)
`starttls`	bool	—	`true` — STARTTLS (connection upgrade, usually port 587)
`from`	object	✓	Sender (see below)
`to`	object	✓	Recipient (see below)
`subject`	string	✓	Email subject
`body`	string	✓	Email body (plain text)

Fields of from and to:

Field	Type	Description
`email`	string	Email address
`name`	string	Display name

Result:

Field	Type	Description
`code`	number	`0` — success, negative — error
`log`	string	SMTP dialog (for debugging)
`error`	string	Error message or `""`

Connection modes

Mode	Port	Config
SMTPS (SSL)	465	`ssl: true`
STARTTLS	587	`starttls: true`
Plain SMTP	25	no flags

Examples

Office 365

let r = send_email({
    host: "smtp.office365.com",
    port: 587,
    ssl: false,
    starttls: true,
    user: "user@yourdomain.com",
    pass: "your_password",
    from: { email: "user@yourdomain.com", name: "System Mailer" },
    to:   { email: "admin@example.com",   name: "Admin" },
    subject: "Alert: service unavailable",
    body: "MyService stopped responding at 14:35."
});

if (r.code === 0) {
    console.log("Email sent");
} else {
    console.log("Error:", r.error);
    console.log("SMTP log:", r.log);
}

Gmail (App Password)

Gmail requires an App Password, not your regular password. Enable it: Google Account → Security → Two-factor authentication → App passwords. Note: Gmail no longer supports SMTP.

Local SMTP (no TLS)

let r = send_email({
    host: "mail.internal.corp",
    port: 25,
    ssl: false,
    starttls: false,
    user: "mailer@internal.corp",
    pass: "password",
    from: { email: "mailer@internal.corp", name: "Mailer" },
    to:   { email: "admin@internal.corp", name: "Admin" },
    subject: "Alert",
    body: "Something went wrong"
});

Sending via config

Config CaEmail.json:

{
  "scriptfile": "./email_send.js",
  "arg": {
    "host": "smtp.office365.com",
    "port": 587,
    "ssl": false,
    "starttls": true,
    "user": "user@yourdomain.com",
    "pass": "CHANGE_ME",
    "from": {
      "email": "user@yourdomain.com",
      "name": "System Mailer"
    },
    "to": {
      "email": "recipient@example.com",
      "name": "Recipient"
    },
    "subject": "Test message",
    "body": "This is a test email from JsN"
  }
}

Script email_send.js:

let resp = send_email({
    host:     arg.host,
    port:     arg.port,
    ssl:      arg.ssl,
    starttls: arg.starttls,
    user:     arg.user,
    pass:     arg.pass,
    from:     arg.from,
    to:       arg.to,
    subject:  arg.subject,
    body:     arg.body
});

console.log(JSON.stringify(resp, null, 2));

JsN.exe CaEmail.json

SMTP debugging

On error, print r.log — it contains the full SMTP dialog:

let r = send_email({ ... });
if (r.code !== 0) {
    console.log("=== SMTP LOG ===");
    console.log(r.log);
    console.log("=== ERROR ===");
    console.log(r.error);
}