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Desperado View Drop Down
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    Posted: 06 August 2007 at 11:49am
I would like to propose a new Generic NDR Option:  Custom Message:
"Your email is being returned because you are an IDIOT!" .  This would provide the Spammers with no information that they did not already know.
The Desperado
Dan Seligmann.
Work: http://www.mags.net
Personal: http://www.desperado.com

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mbrusl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbrusl Quote  Post ReplyReply Direct Link To This Post Posted: 07 August 2007 at 12:28am
I see your point, it is a good idea.  However, what would that serve considering that most emails are being sent from compromised home/business computers anyways on some bot network.  So in that respect, the originating sender would usually never see the returned email.  Thats also another reason I don't bother with NDR's because why send an email back to joe user when the message wasn't even sent from them in the first place but rather from a spammer that spoofed the address in the first place.

Michael

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WebGuyz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WebGuyz Quote  Post ReplyReply Direct Link To This Post Posted: 07 August 2007 at 9:47am
Thats why AuthorizedTo is so important, to eliminate those NDR's. For local mail servers its easy to use an API to pull a list and update SFE. For our remote (Exchange) customers we setup a SQL table and a form where they can enter their users & passwords and the script then injects this info directly into SFE. Customers maintain that list and we bill off of that list since we charge per mailbox. No NDR's and the extra traffic that goes with. Exchange customers understand their users won't ever receive any emails if they don't maintain their list. I imagine Postini does something similar as they don't have LDAP access to everybodys Exchange server. If it isn't in AuthorizedTo, it isn't getting past SFE
http://www.webguyz.net
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Desperado View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Desperado Quote  Post ReplyReply Direct Link To This Post Posted: 07 August 2007 at 11:51am

mbrusl,

Fro the most part, you are correct. The reason we, as an ISP do want the NDR in *mons* but not all cases is that there are many cases where the only way a valid sender knows what went wrong is our bounce.  We service mostly businesses and truning off SDR's would cause a real tech support issue.

WebGuys,

Most of our filtering is bulk Domain based and we simply forward ALL messages out to a customer's server with no control over accounts so the AuthorizedTo is not pratical in that case.  Most of those customers would never maintain an accurate account list. The ones that do, have their own interface and that works for them. We do, however, have a server for our internal mail and we DO have an AuthorizedTo list for the exact reasons you touched on.

HOWEVER .... I was simply venting my frustration above.

The Desperado
Dan Seligmann.
Work: http://www.mags.net
Personal: http://www.desperado.com

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