I having an inconsistent problem with reigstration e-mails and notifications. Some users are getting them and some aren't. There is nothing in my ACP server error log. I'm not sure where to begin to debug this. I recently changed servers and some users say they used to get notifications but now get none. I'm getting more messages through contact form that registration validation e-mails weren't received. Any help is appreciated as always!
I am using SMTP with same domain as web-site. It definitely seems to be a spam filter problem though. Is there any other way to address this short of trying to get unblacklisted from all the various servers blocking my emails?