[How-to] insert this SMTP values?

[DaHiA]

we'd like to use SMTP for outbound emails from our project

this is SMTP values,

Outgoing Mail (SMTP) Server - requires TLS: smtp.my-domain.com (use authentication)
Use Authentication: Yes
Use STARTTLS: Yes (some clients call this SSL)
Port: 465 or 587

also i'd like to know if it's possible to disable/remove the "add new identity" feature to defeat SPAM
any idea how can i apply that ? Huh?
Thanks in advance