I have a php script that will successfully send email to other email servers, but not to Hotmail. It doesn't even trap it as spam - just does not receive it.
In my reading, I found reference to the fact that Hotmail will not receive a message generated by the php mail() function. I find that impossible to believe, but it shows others are seeing a problem (and what are the odds they are trying from the same hosting company.)
I think it might be a problem with headers - header references to the sender's email address not being identical.
My website is hosted at WebHostingHub.com (maybe they are blacklisted at Hotmail?)
Supposedly (and this makes sense), the spam filters look for messages that obviously appear spoofed. The way WebHostingHub sends out email, it is using my main email account, and I can't change that behavior - and don't want to use that (admin) email address at all in the headers. I did create another email account, and put that in the "from" and "reply-to" headers, but from the mailserver logs the hosting company tech was reading, I think it still has the main/admin email account listed in the path (even though I have the "from" email address that I want, listed in the visible header.)
Any help on this will be greatly appreciated!