Question about Outlook Express

A newsletter I need to subscribe to is not showing up in my Inbox nor my Junk Mail. I checked the blocked list, added the sender to the safe senders list, checked the management rules to make sure it wasn't deleted.  The sender says they've had this problem with Outlook users before and suggested I contact support. They recommended I ask that a particular IP address be unblocked. I've seen a few other posts in here regarding this same issue with no apparent resolution. I would really appreciate getting a definite answer.

A newsletter I need to subscribe to is not showing up in my Inbox nor my Junk Mail. I checked the blocked list, added the sender to the safe senders list, checked the management rules to make sure it wasn't deleted.  The sender says they've had this problem with Outlook users before and suggested I contact support. They recommended I ask that a particular IP address be unblocked. I've seen a few other posts in here regarding this same issue with no apparent resolution. I would really appreciate getting a definite answer.