Hi winfly,
Sorry for any confusion; we’ve actually just made an edit to our own wiki regarding SMTP configurations. Port 587 is the recommended one to use here, with SMTP Auth enabled. If you’d like to use the SSL SMTP port, that would actually be 465. You’ll of course want to be sure your to/from addresses for the form are hosted with us @yourdomain.com as well. See this for further details! https://wiki.dreamhost.com/E-Mail_Client_Configuration
Thanks!
Matt C
