Hi Hagforce, .. the most important solve is the trouble with the reverse-DNS.. Example: your "mailserver" has the name "mail.yourdomain.com". your reverse-dns need to resolve to "mail.yourdomain.com" and this is only in the "goodwill" of your internet-provider. You have to say them that normal y reverse-resulaution must point to "mail.vourdomain.com" . (I had the exact same problem) After that check it with a traceroute to mail.yourdomain.com and have a look WHAT is printed in the monitor as last entry.. it must be "mail.yourdoamin.com" and not "static48.provideretcetc.com". If you have this, you can send mails to hotmail, BUT .. the mails will be received in the "Junk-Mail-Folder" automatically - as long as the mailbox owner decide that this mails are NOT spam. If you have an SPF-record, you have to transmit it to Hotmail ([email protected], though this is pretty a case of luck, because I did it more times and my mails are send to Junk-Mail-folder too until today).