I can only see SMTP as the Mail Server under Membership Settings » Email » Mail Server. How do I add Aweber, MailChimp, etc.?
This happens due to the SMTP being the only gateway to send membership emails. You can’t send membership emails with Aweber, MailChimp etc. MailChimp. Aweber is autoresponder, not an SMTP. Hence this is not shown on Mail Server setting.