Tim S.
Hi tacit, Thanks for posting your question. I'm more than happy to assist you today. It sounds like you are referring to SMTP authentication and spoofing. If this is not what you're talking about can you explain it a bit further? Spoofing is when an email is sent from one email address but looks like it originated from another account. There are ways to combat spoofing namely setting up SPF records. SPF records are DNS records that specify what machines can send emails on the behalf of the domain. Here's an article on how to set up SPF records: Email Authentication and SPF Records Here's an article explaining spoofing: Email Spoofing and Domain Keys If you need further assistance please feel free to contact us. Thanks! Tim S