Problem in accessing mailbox

Problem in accessing mailbox

Dear support,

I use a domain thaicraft.org with setting up many mailboxes a few months ago. I just found a problem that one of my mailbox can't access. I try to login to info@thaicraft.org, but it always login to kannika@thaicraft.org mailbox. If I try to login kannika@thaicraft.org, it can login and work properly. I don't know why. It has no reason to occur this. Please urgently investigate. Thank you.