Does Zoho Campaign send to gMail users?

Does Zoho Campaign send to gMail users?

I have two gMail eMail addresses and I entered them both as "test" contacts in my Zoho CRM - to the burnout quiz takers list.

Zoho Campaign says the eMails were sent to both test contacts (both gMail eMails).
But, neither gMail account has received a new message and neither message can be found in the gMail spam folder either.

Any ideas?