If you happen to have any Microsoft email addresses at Hotmail and Outlook domains in particular, please be aware they will most likely bounce from here. In the last couple of months there appears to an increase in Microsoft black listing everyone, having this problem with all of services and those at work too. Microsoft are also increasingly ignore requests to delist, possibly due to the ease and frequency such accounts are using used to spread spam.
I would personally advise you, in particular if you sign up to this forum not to use Hotmail or Outlook email addresses, and should you find messages not getting to you let me know or use another email address.
I will continue to fight Microsoft’s archaic email system and get a delist or find an IP address for a mail server which has not been black listed as I did at work.