How can I hide IIS SMTP version number?
Go to cmd.exe then run
cd c:\Inetpub\Adminscripts
cscript adsutil.vbs set smtpscv/ vsi number /connectresponse “New banner here”
I've found the answer after a while and decided to help others which have the same question.
If you open the MetaBase.xml go to
<IIsSmtpServer Location ="/LM/SmtpSvc/1"- Add
ConnectResponse="String of Your Own Choice here"to the step above. - Reboot your server if
EnableEditWhileRunningis not enabled
The version is hidden now.