Having problems sending emails from Zoho Mail

Having problems sending emails from Zoho Mail

Hello,
I sent an email a few minutes ago to a couple of people, including two of my own Gmails, from Zoho Mail. For some reason I haven't received the email on EITHER gmail account. I tried sending an email from Gmail to Zoho Mail, and it worked. So I can receive emails but not send emails. Help please!
Thanks!
Noble Obodum
Chief Operations Officer
Head Webmaster
Adventist Outreach Kids
nobodum@theaoks.gq
nobelpeaceprizeis@gmail.com