Amazon SES or Mandrill would probably be helpful. Both have generous free tiers.
But you are still sending all your outgoing email through an external 3rd party. Not ideal. Also, these days every email is a top-reply orgy of all correspondence ever sent, so your SMTP relay essentially gets a copy of your entire conversational inbox (via "QUOTE ALL THE THINGS" reply garbage) as well as your outbox.
But you are still sending all your outgoing email through an external 3rd party. Not ideal. Also, these days every email is a top-reply orgy of all correspondence ever sent, so your SMTP relay essentially gets a copy of your entire conversational inbox (via "QUOTE ALL THE THINGS" reply garbage) as well as your outbox.