But if I were running email for any new organisation I wouldn't have that luxury ofcourse - I'd have to pay for a Google/outlook or other major provider account - or spend a lot of time "reversing" the reputation of the ip/ip block my dedicated servers had - and as none of the major providers provide a simple check like rbl etc - it's a frustrating guessing game where your test-mails to your own Gmail(etc) account go through, but mail to new senders is silently dumped to the spam folder.

I don't mind greylisting, mail bouncing or blacklisting. It's the magic "intelligent" filtering which is annoying - because the only indication of error is that you don't get a reply - because your recipient haven't seen your mail.

In a way it's worse that it's rare - you never know if you've fixed the issue, or some arcane combination of your sending configuration and email content (an email not in English?! Probably spam!) will mean a new recipient will never see your mails.