Strange addition to recipients' email

[RichardW3919]

Why did the email I sent - and received - add the warnings shown below?  "(Explor Cruises via auth.ccsend.com)" and "We could not verify the identity of he sender....."  These may result in the email going to Spam, would they not?

[William_D]

Hello @RichardW3919 ,

To have these types of messages not appear, you'll want to look into authentication, especially self-authentication if you have your own domain. If you have additional questions or need more direct insight regarding your account, I'd recommend speaking with our Deliverability team.