You're not the only one. You may want to complain to Ipswitch, especially if you did get listed in a spam database for using their option that breaks your RFC compliance, and annoys other mailserver admins. A KB article on this ( http://support.ipswitch.com/kb/IM-19981218-EM04.htm ) says "Why do we allow you to set it up non-compliant? Because we get swamped with DEMANDS from our customers to change things. If the change will force non-compliance, we make it an option. Some changes we will not honor even under demand due to the problems that it causes other systems." I haven't heard a single person that has been happy with this "feature", and it DOES cause serious problems both to other systems, and the systems that use it.thats what I was afraid of. I had originally checked the "NUL <> Sender?" as a measure to prevent spam.
If you ask politely, I would be more than happy to add you to http://www.rfc-ignorant.org . I won't do it unless you ask (or do something dumb, like brag about how other admins now have to deal with your bounces), but would be happy to show you that you will get listed.But I'm only also only relaying mail for IP ranges and authenticated users. So I doubt I'll end up on orbs or anything lists like that, again.
The problems include:
[1] You will no longer receive bounce messages,
[2] You will no longer receive DSNs (delivery status notifications)
[3] "double bounces" will now occur, so bounces that should have gone to your users will get sent to remote postmasters
[4] You'll end up in spam databases.
As spam becomes a bigger and bigger problem, more and more people will expect that you run your mailserver in compliance with the RFCs. If you annoy other mailserver admins (as your are doing now with the double bounces), they will start blocking you.
Your benefit includes:
[1] Cutting down spam by 0.25% (no, not .25 which is 25%, that's 0.25%). That's less than 1 in 350 spams.
A search of the last 3,400 or so spams we received showed that only 9 used the <> address. Not only that, but they are the ones that are easy to catch anyway (they averaged a weight of 43, whereas most of our customers block spam on a weight of 10 or 20). So even a simple filter will likely catch that spam for you.
But, if you want to lose legitimate mail and annoy other admins, it's your right. :)
-Scott
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