the confirmation email did not enter the YAHOO account in EM CLIENT.

I tried to join a site.
The site sent a confirmation e-mail to me in writing.
However, the confirmation email did not enter the YAHOO account in EM CLIENT.
I had no choice but to log in to the YAHOO site directly.
There was already an unread mail in the YAHOO MAIL box.
Nevertheless, there is no incoming mail in the EM CLIENT.
I hope this problem will be fixed.