Salesforce
Optional. Connect it if you keep your clients there. If you do not, you are not asked to.
What it connects to
Four things, and no others. You can check your own client and do-not-contact lists, check Salesforce, or add no extra check. People who opted out are always left alone.
Your own lists
A client list and a do-not-contact list, kept by you. Anyone on either is left alone.
Chrome
Mahleon is a Chrome add-on. Sending runs in the browser you already use, on the LinkedIn account you are signed in to.
Sales Navigator
A place to find people, using the account you already have. Mahleon does not supply one, and it does not send from it.