This service can be configured on the Business tariff.
To change the tariff please follow the instruction
After you connect the Business tariff, open Parameters.
On the Profile tab, in the Correspondence email box, type the desired e-mail address.
Then set the checkbox Send messages from it.
Soon on this address will come a message to confirm the e-mail.
After confirmation, make a test order.
Make sure that letters to customers come with new mail.