Display name of send request not forwarded to outbound postbox

Hey there!

I am sending E-Mails from our SAP-System. This works except for one little annoying issue:

When creating the the SENDER-object, I specify a display name:

 

DATA(sender_addr) = cl_cam_address_bcs=>create_internet_address(
i_address_string = CONV #( sender_mail_address )
i_address_name = CONV #( sender_display_name ) ).

 

The display name (Bugtracker IDX) can be seen in the outbound queue (Transaction SCOT):

But when sending the Mail to the recipient, the from-address is “Mail Service”

The recipient in this case is my company E-mail-address. 

We are using office365.

What can I do to pass the senders display name to the office365-mail postbox?

Any places where to look at?

Thanks for any hints!

Enno

PS: a GMX-postoffice displays the name perfectly: