issue with @yahoo.com

Hi sir,
I hope everything is good with you.
Please, I have the following issue,
The problem is when i send any email from [email protected],
so it is not working. I mean i will not get it.
But when the customer email address used gmail address like, [email protected],
them it is working fine. I mean i will get it.
So where is the problem ? pleasae

Best regards
A.J.

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