> To make sure that no one can send mail remotely off of the server. > For the most part, it has worked very well, however a user with the > sending address of "<>" is always able to send mail off the server.
As must be allowed, both per the RFCs *and in order to allow bounce messages to be returned to your users*. Apparently, you haven't followed the hundreds of posts on this issue. Please look in the archives and I hope you are enlightened--you MUST allow the null <> sender if you are going to operate a mail server exposed to the public Internet and referenced in a public MX record. (For the record, 'Refuse Null Sender,' one of the lamest options in IMail, will allow you to disable this mandatory feature, so if it's still being blocked, you likely have not restarted SMTP since making the change. Not that it matters, since you have to uncheck it pronto--actually, according to my recent check of your IP, <> is indeed blocked, so you should have updated your post.) However, allowing <> to send inbound mail does not allow <> to relay mail, so your problems lie elsewhere. I can guess at exactly where you erred. You probably are allowing 'Relay for Local Users,' given this Telnet trace: > 220 X1 NT-ESMTP Server mail.broadcastzone.biz (IMail 6.06 17-1) > mail from:<[EMAIL PROTECTED]> > 250 ok > rcpt to:[EMAIL PROTECTED] > 250 ok its for <[EMAIL PROTECTED]> And again, looking in the list archives and Ipswitch KB will tell you that the ONLY safe options for relaying are 'Do Not Relay' and 'Relay for Addresses.' Otherwise, you are an open relay. Now, this... > 4.) All boxes checked in SMTP Security Tab ...is just crazy. In disabling SMTP AUTH reporting, for one, you are in effect disabling SMTP AUTH from most mail clients. And checking the 'Allow Remote...' options DECREASES the security of your server. You need a major primer in the way IMail operates, I'm afraid, which only the archives and KB can give you. When you have some specific questions, post back. -Sandy To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
