An Account is Neither Showing any email in inbox nor receiving any email

An Account is Neither Showing any email in inbox nor receiving any email

Hi,

When i open my account it shows empty inbox.
i tried to send an email from other account but the inbox remains empty.
Kindly, solve this issue ASAP.
i'm attaching the screenshot as well.
Detail:
Domain: bmco.pk
Account:  accounts@bmco.pk

Thanks.