I need to amend our smtp banner as its not currently configured properly. But I wanted to clarify some points.
Our dns is external with mail.ourdomain.com pointing to the host ip. Can I amend the A record to point to our external IP and then change the smtp banner to mail.ourdomain.com will there be any adverse effects?
if the mail sent from our domain is @domainname.com can I just set the smtp banner as domainname.com?