> as long as you're not using it for marketing you'll be fine. Really? That hasn't been my experience the last couple of years. I wasn't joking when I said tha

> as long as you're not using it for marketing you'll be fine. Really? That hasn't been my experience the last couple of years. I wasn't joking when I said that Google and MS routinely blackhole mails from my users to their users. These are legitimate mails. Sent by real people, to real people. Often people they've been conversing with for years. You can play by the rules, set up SPF, DKIM, periodically check blacklist statuses and be perfectly fine, and suddenly mail still disappears. No bounces, and no ability to contact an MS or Google postmaster to shout at. This certainly isn't due to incompetence on their part, so I can only assume it's a strategy to frustrate mail server operators to simply give up and use their little walled e-mail garden.