Use the most trusted e-mail sending service you can find and afford. Don't roll your own. Spam has made e-mail such an untrustworthy system that your e-mail's o

Use the most trusted e-mail sending service you can find and afford. Don't roll your own. Spam has made e-mail such an untrustworthy system that your e-mail's origin has to have a track record, these days. You'll find a continuum of options for e-mail sending services. I'd pick the one that's most trusted within reason, not necessarily the "best deal." To me, it's an image thing: every time your e-mail ends in a Spam folder you let that user down a little. If they do find it, you've still disappointed them a little.