Friendly Name and "Sent by"

When I write an email and send it through SMTP to someone else the sender address appears with

“FriendlyName” address@domain.com

Sent by: address@domain.com

I’ve checked the Calendarprofile and it is alright. The mail is send with the right UserID.

The Problem only appears when I define the Internetaddress in the location document with a friendly name “FriendlyName” address@domain.com

In all the other domains this works fine.

The mail leaves the domino server correctly.

The sent by: field appears only at the receipients site (tested more than one).

This happens to every user from this domain.

The route is Notes - Linux - Internet

Might there be a misconfiguration at the linux server?

thanks for you help