Email not receiving

our web site hosted in dreamhost name Suddenly 1 of our employee (suppose email address - is not receiving any emails, but outgoing is ok. And there is no error while sending/receiving!!! POP3 is

I’ve checked in the dreamhost, but no problem found…
any idea what kind of problem is it?

Check if they’ve changed forwarding rules or their Spam Assassin settings.

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No change in spam settings.
All of us getting emails, except 2 those email addresses…
Quite confusing…