Gmail couldn't verify that mydomain.com actually sent this message (not a spam mail).

Gmail couldn't verify that mydomain.com actually sent this message (not a spam mail).

Hi,

I am new for Zoho Mail and just setup email using my domain. After I send email (e.g, me@mydomain.com) from Zoho to gmail, a red question mark with grey background is in front of my Zoho email address when open that email. And the following text displays when hovering the question mark:

Gmail couldn't verify that mydomain.com actually sent this message (and not a spammer).


Thank you.

Ralph