Unable to send message;Reason:554 5.1.8 Email Outgoing Blocked. bigjump@zohomail.in

Unable to send message;Reason:554 5.1.8 Email Outgoing Blocked. bigjump@zohomail.in

Hi,

I have have opened my new Zohomail account - bigjump@zohomail.in just few hour back

TFA is also done

There is no question of quota exceeding as few hourse back I created account

There is no question of any bulk mailing

But still whilete sending a simple email it shows the warning of :-

Unable to send message;Reason:554 5.1.8 Email Outgoing Blocked

You can also see the screen shot at :

https://i.imgur.com/LJctXmG.jpg

Can you please help .

Regards,
Ajay