Zoho verification emails are NOT arriving

Zoho verification emails are NOT arriving

ok - one email arrived - only took an hour...


I'm trying to verify a email address associated with my domain.
I've requested a verification email sent to my gmail account at least THREE times.
Screenshot - zoho saying email has been sent:  http://screencast.com/t/JhXfguwJ
The zoho email verification message never arrives (yes i've checked all gmail 'tabs' , spam, etc - zero email from zoho)
Suggestions?