Rocket.Chat/app/lib/server/methods/sendSMTPTestEmail.js

import { Meteor } from 'meteor/meteor';
import { DDPRateLimiter } from 'meteor/ddp-rate-limiter';

import * as Mailer from '../../../mailer';
import { settings } from '../../../settings';

Meteor.methods({
	sendSMTPTestEmail() {
		if (!Meteor.userId()) {
			throw new Meteor.Error('error-invalid-user', 'Invalid user', {
				method: 'sendSMTPTestEmail',
			});
		}
		const user = Meteor.user();
		if (!user.emails && !user.emails[0] && user.emails[0].address) {
			throw new Meteor.Error('error-invalid-email', 'Invalid email', {
				method: 'sendSMTPTestEmail',
			});
		}
		try {
			Mailer.send({
				to: user.emails[0].address,
				from: settings.get('From_Email'),
				subject: 'SMTP Test Email',
				html: '<p>You have successfully sent an email</p>',
			});
		} catch ({ message }) {
			throw new Meteor.Error('error-email-send-failed', `Error trying to send email: ${ message }`, {
				method: 'sendSMTPTestEmail',
				message,
			});
		}
		return {
			message: 'Your_mail_was_sent_to_s',
			params: [user.emails[0].address],
		};
	},
});

DDPRateLimiter.addRule({
	type: 'method',
	name: 'sendSMTPTestEmail',
	userId() {
		return true;
	},
}, 1, 1000);