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@zrb The normal way is installing postfix, and possibly proxying outbound connections thru a VPS on a reputable hosting provider if your port 25 is blocked or bad-rep.

This does not give the VPS host access to your outbound mail contents if you're forcing STARTTLS* because TLS is terminated on your side.

I'm running custom software far simpler than postfix on mine.

(* unless they're actively MITM'ing with a forged certificate and either the recipient server isn't using DANE or you're not validating it)