I'm a hosting reseller and soem of my customers report email delay. One even delay 7 days. I check the header of the email and found that it's been arrived on server few seconds later after being sent out but takes 7 days to go into the mailbox on server. My hosting company told me it's a file lock problem and seems not willing to do any thing on it. Are there anyone had similar problem and how can we get it fixed? Thanks.