Yet another recent “Fuck you” from Microsoft: it seems that Hotmail (or Live or whatever it’s called these days) won’t accept e-mails from my dedicated server despite its crystal clear Anti-Spam-Reputation:
Feb 26 11:44:36 lvps176-28-14-79 postfix/smtp[21858]: 19FFF1167A7: to=<redacted@live.se>, relay=mx4.hotmail.com[65.55.33.135]:25, delay=1, delays=0/0/0.88/0.16, dsn=5.0.0, status=bounced (host mx4.hotmail.com[65.55.33.135] said: 550 SC-001 (COL004-MC6F12) Unfortunately, messages from 176.28.14.79 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL FROM command))
Well, that’s unfortunate but nothing I can do about at the moment since they don’t even have an IP removal submission form or any other sane way of contacting someone who cares, so… If you’re a Hotmail user and haven’t had a reply from me: that’s why 
I recommend the forums as an alternative way to contact me. Cheers!