I have my domain hosted on Wordpress, with the DNS MX records setup as documented in the Zoho config guide. But emails sent to my address are being bounced with a "relay access denied" message.

Using  https://mxtoolbox.com/SuperTool.aspx, I tested the MX records, and got the following report. Any ideas?

Thanks!

Connecting to 74.201.155.125

220 mx.zohomail.com SMTP Server ready June 21, 2016 6:33:51 PM PDT [781 ms]
EHLO PWS3.mxtoolbox.com
250-mx.zohomail.com Hello PWS3.mxtoolbox.com (pws3.mxtoolbox.com (64.20.227.134))
250-STARTTLS
250 SIZE 53477376 [1016 ms]
MAIL FROM:<supertool@mxtoolbox.com>
250 Sender <supertool@mxtoolbox.com> OK [781 ms]
RCPT TO:<test@example.com>
553 Relaying disallowed [781 ms]

PWS3v2 4719ms