Emails not getting displayed

Hi,

I sent 2 emails from zoho.com. I sent both emails to a gmail domain and to self (@zoho.com). Although the message preview dispays the mail snippet, emails aren't getting displayed in the zoho.com web interface (new & old versions) or on iOS default mail client (iPhone) or in Mozilla thunderbird in Linux. I checked the message source & that has the message content. Perhaps, there's some issue with the html code that is sent?