diff --git a/apps/meteor/app/lib/server/functions/saveUser/sendUserEmail.ts b/apps/meteor/app/lib/server/functions/saveUser/sendUserEmail.ts
index 747f1909d98..8761dd4d173 100644
--- a/apps/meteor/app/lib/server/functions/saveUser/sendUserEmail.ts
+++ b/apps/meteor/app/lib/server/functions/saveUser/sendUserEmail.ts
@@ -1,4 +1,5 @@
 import { MeteorError } from '@rocket.chat/core-services';
+import { Meteor } from 'meteor/meteor';
 
 import type { SaveUserData } from './saveUser';
 import * as Mailer from '../../../../mailer/server/api';
diff --git a/apps/meteor/tests/unit/app/lib/server/functions/sendUserEmail.spec.ts b/apps/meteor/tests/unit/app/lib/server/functions/sendUserEmail.spec.ts
new file mode 100644
index 00000000000..23bc90cd50b
--- /dev/null
+++ b/apps/meteor/tests/unit/app/lib/server/functions/sendUserEmail.spec.ts
@@ -0,0 +1,154 @@
+import { MeteorError } from '@rocket.chat/core-services';
+import { expect } from 'chai';
+import { describe, it, beforeEach, afterEach } from 'mocha';
+import mock from 'proxyquire';
+import Sinon from 'sinon';
+
+type SendUserEmailFn = (subject: string, html: string, user: { email?: string; password?: string; name?: string }) => Promise<void>;
+type SendHelperFn = (user: { email?: string; password?: string; name?: string }) => Promise<void>;
+
+const userData = {
+	email: 'test@example.com',
+	password: '123456',
+	name: 'Test User',
+};
+
+const makeStubs = () => {
+	const MailerStub = {
+		getTemplate: Sinon.stub(),
+		send: Sinon.stub(),
+	};
+
+	const SettingsStub = {
+		settings: {
+			get: Sinon.stub().callsFake((key: string) => {
+				if (key === 'From_Email') return 'no-reply@example.com';
+				if (key === 'Accounts_UserAddedEmail_Subject') return 'Welcome [name]!';
+				if (key === 'Password_Changed_Email_Subject') return 'Password Changed';
+				return '';
+			}),
+		},
+	};
+
+	const MeteorStub = {
+		Meteor: {
+			startup: Sinon.stub(),
+		},
+	};
+
+	return { MailerStub, SettingsStub, MeteorStub };
+};
+
+describe('sendUserEmail (Mocha + TS)', () => {
+	let MailerStub: { getTemplate: Sinon.SinonStub; send: Sinon.SinonStub };
+	let SettingsStub: { settings: { get: Sinon.SinonStub } };
+	let MeteorStub: { Meteor: { startup: Sinon.SinonStub } };
+
+	let sendUserEmail: SendUserEmailFn;
+	let sendWelcomeEmail: SendHelperFn;
+	let sendPasswordEmail: SendHelperFn;
+
+	beforeEach(() => {
+		const stubs = makeStubs();
+		MailerStub = stubs.MailerStub as any;
+		SettingsStub = stubs.SettingsStub as any;
+		MeteorStub = stubs.MeteorStub as any;
+
+		const mod = mock.noCallThru().load('./../../../../../../../meteor/app/lib/server/functions/saveUser/sendUserEmail.ts', {
+			'../../../../mailer/server/api': MailerStub,
+			'../../../../settings/server': SettingsStub,
+			'meteor/meteor': MeteorStub,
+		}) as any;
+
+		sendUserEmail = mod.sendUserEmail as SendUserEmailFn;
+		sendWelcomeEmail = mod.sendWelcomeEmail as SendHelperFn;
+		sendPasswordEmail = mod.sendPasswordEmail as SendHelperFn;
+	});
+
+	afterEach(() => {
+		Sinon.restore();
+	});
+
+	describe('sendUserEmail', () => {
+		it('should not send email if userData.email is missing', async () => {
+			await sendUserEmail('subject', '<p>html</p>', { ...userData, email: undefined });
+
+			Sinon.assert.notCalled(MailerStub.send);
+		});
+
+		it('should send email with correct parameters', async () => {
+			await sendUserEmail('subject', '<p>html</p>', userData);
+
+			Sinon.assert.calledOnce(MailerStub.send);
+			const callArg = MailerStub.send.getCall(0).args[0];
+			expect(callArg).to.be.an('object');
+			expect(callArg).to.include({
+				to: userData.email,
+				from: SettingsStub.settings.get('From_Email'),
+				subject: 'subject',
+				html: '<p>html</p>',
+			});
+			expect(callArg.data).to.include({
+				email: userData.email,
+				password: userData.password,
+				name: userData.name,
+			});
+		});
+
+		it('should throw MeteorError if Mailer.send fails', async () => {
+			MailerStub.send.throws(new Error('fail'));
+
+			let thrown = false;
+			try {
+				await sendUserEmail('subject', '<p>html</p>', userData);
+			} catch (err) {
+				thrown = true;
+				expect(err).to.be.instanceOf(MeteorError);
+			}
+			expect(thrown).to.equal(true);
+		});
+
+		it('should mask password in email data if password is not provided', async () => {
+			await sendUserEmail('subject', '<p>html</p>', { ...userData, password: undefined });
+
+			Sinon.assert.calledOnce(MailerStub.send);
+			const callArg = MailerStub.send.getCall(0).args[0];
+			expect(callArg.data).to.include({
+				email: userData.email,
+				password: '******',
+				name: userData.name,
+			});
+		});
+	});
+
+	describe('sendWelcomeEmail', () => {
+		it('should call sendUserEmail with welcome subject and template', async () => {
+			await sendWelcomeEmail(userData);
+
+			Sinon.assert.calledOnce(MailerStub.send);
+			const callArg = MailerStub.send.getCall(0).args[0];
+			expect(callArg).to.include({
+				subject: `Welcome [name]!`,
+				to: userData.email,
+			});
+			expect(callArg.data).to.deep.equal({
+				email: userData.email,
+				password: userData.password,
+				name: userData.name,
+			});
+		});
+	});
+
+	describe('sendPasswordEmail', () => {
+		it('should call sendUserEmail with password subject and template', async () => {
+			await sendPasswordEmail(userData);
+
+			Sinon.assert.calledOnce(MailerStub.send);
+			const callArg = MailerStub.send.getCall(0).args[0];
+			expect(callArg).to.include({
+				subject: 'Password Changed',
+				to: userData.email,
+			});
+		});
+	});
+});