Exchange 2016 http Headers information hide for external world and Undeliver Emails are showing servers headers information

Undelivered Emails are showing Exchange server 2016 servers Host name and IMSVA Headers information. How to remove the Servers host name and postmaster Emails.

Recently i worked OWA - to remove the Servers Headers information in IIS. Kindly suggest me how to remove the servers headers information.

1.https://mail.domain/owa  ----->it's not showing the servers information as per the Microsoft Technet article.(https://blogoffice365.com/secure-owa-headers-for-exchange-server/)
2.If i use https://mail.domain --->it's showing the servers information in sniffer information in sniffer tool.(http://www.1-hit.com/sniffer.htm).

HTTP Response Header : HTTP/1.1 302 Moved Temporarily
X_FESERVER : "SERVER HOST NAME" it's appearing. Need to hide for external world.

3.Undeliver emails are showing Exchange servers headers information for External and Internal Emails.

Please suggest me, how to disable the Exchange 2016 servers host names in undelivered Emails and https://mail.domain.com server X_FESERVER: "SERVER HOST NAME"

Your help must be appriciated.

Thanks-Sami