title: Can I use SMTP with Swift Mailer while not defining a username and password
body: <p>I am trying to use Swift Mailer to send an email to a client on her website. The problem is, I do not know her username/password email information, and I do not want to use mine.</p>
  
  <p>Is there a way to use SMTP with Swift Mailer, and not define a username, password, or email host? Kinda how the mail function will allow you to use anything for the to/from addresses.</p>