I am sending mails to an org list with many subscribers and I receive lot of auto replies. How can I disable them from client side or server side ?
Thanks
You're getting auto replies from the recipients? If that's the case then you can't disable them as they're being generated by the remote MTA or email client, not from your MTA.
If you are using Exchange, there is a setting, specific to the version, that allows you to block system messages (OOF, mailbox full, NDR, etc) from being forwarded to the Internet. You'll need to check the docs for the setting specific to your version.