The problem we face is the .smd files get generated automatically.
.SMD files are just the files that IMail uses when an E-mail arrives. So what you are really saying is that "E-mail gets generated automatically". That would occur if you have a program running that automatically generates E-mail.
Neither sender or receiver is hosted on the server.
This helps narrow it down -- this means that the E-mails are being relayed for a mail client. For example, when you send E-mail to this list, the received is not hosted on your server (and IMail, like most mailservers, doesn't check the return address, as it is trivial to forge).
Can t find any solution to prevent this problem. Is there any suggestion to prevent this? The relay on the server is closed. So is it enough for stopping the spam mails originating from the server?
Well, it sounds like there is spam originating from your server, so there is definitely a problem.
First, you *must* make sure that the anti-relay settings are either "No Mail Relay" or "Relay for Addresses". Anything else is really "Relay for spammers".
If you have done that, you can then check the IMail SMTP log file to see where these E-mails are coming from, and to see how they are getting in (is the spammer authenticating? coming from an IP you listed as safe? using a deprecated routing protocol that IMail accepts?).
-Scott
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