You can specify the cc, bcc, and replyTo fields for more control over who you send the email to and where people will reply to:
const msg = {
to: 'recipient@example.org',
cc: 'someone@example.org',
bcc: ['me@example.org', 'you@example.org'],
from: 'sender@example.org',
replyTo: 'othersender@example.org',
subject: 'Hello world',
text: 'Hello plain world!',
html: '<p>Hello HTML world!</p>',
};