How about bringing the golden days of Hotmail?
For those early Hotmail users you might have observed that when someone sends a message from hotmail to another co-hotmail user you would be getting a message like "Your message has been instantly delivered by HotmailDirect" and for other domains it would say "Your message was sent".
Just thought if ZohoMail could emulate this behavior that when we send an email to co-Zoho user it should say 'DELIVERED' and for others it can say 'SENT'.
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Deepak Vasudevan
http://thamizhththendral.blogspot.com/