Messages

Please anybody help me please.
I need your help.

When i use a Gmail email address for order products in my store, then its work fine.
I receive registretion email and order confirmation email as a customer.
But when i use a yahoo email address for as a customer registretion and placed a order in my store, i do not receive registretion email and order confirmation email.
Please help me to fix the problem.
I want all other emails work fine in my store for customers.
Please.

Thank you so much for your response.
Can you please check my abantecart store control panal for email tab details?

I newly created a AbanteCart store.
My store is- eshopee.meximas.com, this website is created by Hostinger.in.
And now my question is, i test my products order.
I order products as a customer in my store.
And i use different email address for order.
But when i placed an order in my store, then i do not receive Order Confirmation email as a customer to my different email address.
Why?
And when i use a gmail email address for test order, then i receive confirmation email as a customer to the email.
But when i use a yahoo mail address as a customer, then i do not receive order confirmation email. Why?
Now what should i do?
Please tell me as soon as possible.
Its ****** please.
Please tell me.