Note that this requires the outbound mail server to support relaying, and again make sure your sending domain's SPF is correct. Your sending domain must list [

Note that this requires the outbound mail server to support relaying, and again make sure your sending domain's SPF is correct. Your sending domain must list [email provider smtp outbound] in its SPF record. I would only choose this option if I were having delivery issues. Which I never have with this setup. Also, if you route your emails through your ISP, well, don't expect privacy.