It's a configuration document setting. Technically, that is RFC 822 vs. 821 compliance. You are currently using 821. You want to see 822. You set this under MIME/Advanced/Advanced Outbound Message Options. There is a field there for RFC822 Phrase Handling. You want to enable that, and most likely using DN as phrase (Distinguished Name).
Dig Deeper on Lotus Notes Domino Administration Tools
Related Q&A from Michael Lazar
Learn how to easily keep track of the numbers of incoming and outgoing Lotus Notes email messages to and from your Domino server each day. Continue Reading
Discover what steps you can take if your Lotus Domino server runs out of disk space and you have issues sending and receiving Lotus Notes email ... Continue Reading