Try removing the names and re-adding themmanually (this has resolved issues for me in the past). Also, create a stepthat ONLY sends to that address, in case there is an issue with the addressitself.
Note that Outlook occasionally marksemails from Livelink as Junk so it would be worth confirming with the receiverthat this has not occurred, and also with the recipient’s emailAdministrator that it was not blocked at the email server (although the latteris less likely as others received the email).
Phil F