Cannot send emails but can receive

Cannot send emails but can receive

Hi,
When trying to send an email - it seems to be sent successfully and appears in the Sent folder, but it never arrives to the recipient. I tried sending to several different accounts. I can receive emails though.

My domain is hosted with Godaddy. MX records as follows:
Priority Host Points To TTL Actions
10 @ mx.zoho.com 1 Hour
20 @ mx2.zoho.com 1/2 Hour

Can anyone advice what might be wrong?
Best regards,
Alex