Email "sender" field

Email "sender" field

When I send an email during CRM activities, the system send : send by (name....)@zohocrm.com 
But I do not want appears these info, i just want mail-receiver see my email, without @zohocrm.com final part.

THis is a new problem since some weeks ago, it did not happen.

Do anyone have any info on how to solve that? Thank you in advance!
Alessandro