@hotmail.com @msn.* @live.com @outlook.com emails still appear to be delaying (temporarily blocking) our emails.
They do this once in a while and we're trying to clear that up right now. Can you please try adding firstname.lastname@example.org
on your safe list / address list? What happens is when people start safe-listing our email, the provider will see that our IP is legitimate. The more people doing this the better.
Please let us know if it helped.