Hotmail rejecting mail from PN [Diagnostic-Code: smtp; 550 5.7.1]

[#1]

@fulmar "  This is not surprising since relay.plus.net is an open relay and anyone can use it, including spammers, which is why servers such a hotmail won't accept mail from it."

Is it still an open relay? I'd thought years ago they changed it so it needed a password? 

I could of course be wrong.. I do remember open relays at some point (maybe even different ISP) but I'm currently set to security Starttls and "normal password" - so a password.

If they do still "need" an open relay (why??) would the solution not be to offer a second closed server on a different IP that we can all use that won't be blocked? 

EDIT: They could even probably (?) route it so that anyone logged in using a password to send email, it goes to a second internal server before exiting plusnet so nobody needs to change configuration?

[#2]

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@plusnettony wrote:
....there has been vast improvement of late in sending to Hotmail. 

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I know I said my last word on this topic was post 228 but I've just inadvertently used one of my PN email address to send a message to a Hotmail contact.  I got an instant bounce, same old, same old, error 🙄

There's also this post:

https://community.plus.net/t5/Email/Edit-of-SPF-needed-to-avoid-bouncing-emails/m-p/2045720#M60686

made earlier today reporting the same thing.

How does that equate to "vast improvement"?