They get a 554 from your server, their server delivers the NDR. They fix it or you whitelist them. No worry about losing them as a customer, they already can't email most other places reverse DNS is a very common check.
And whitelisting is part of the process, if you are going to blacklist. If they won't comply you whitelist them. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:bounce- > [EMAIL PROTECTED] On Behalf Of Dean Cunningham > Sent: Wednesday, December 19, 2007 7:41 PM > To: Exchange Discussions > Subject: RE: Email philosophy 101 - Spam NDRs > > "Aggressively checking during SMTP" > > Hmm wot say your best customer does not practice some of the things you > would like them to do in terms of *their* SMTP setup, by this I mean > reverse DNS lookups etc. > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Kennedy, Jim > Sent: Thursday, 20 December 2007 10:35 > To: Exchange Discussions > Subject: RE: Email philosophy 101 - Spam NDRs > > > Sorry, didn't see the last part that says some of them are valid 'to' > addresses. > > Agressivley checking during SMTP will clobber many of those. The > correct > RBL's, circular DNS checking and you will eliminate most of those. > Those > few that make it through should be tagged and delivered or Quaranteened > for release. You shouldn't solve your spam problem by abusing the > forged > from address. Not a perfect solution but I think it is the lesser of > the > evils. > > What if the CEO of your best customer is the forged from and you > clobber > him with a 1000 NDR's? Not that far fetched considering the number of > Virus's that attack Outlook address books and use one of the for the > forged from. > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:bounce- > > [EMAIL PROTECTED] On Behalf Of Kennedy, Jim > > Sent: Wednesday, December 19, 2007 4:27 PM > > To: Exchange Discussions > > Subject: RE: Email philosophy 101 - Spam NDRs > > > > > > 3) You should get a spam solution that will do realtime recipient > > checking and 554 them during SMTP. > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:bounce- > > > [EMAIL PROTECTED] On Behalf Of East, Bill > > > Sent: Wednesday, December 19, 2007 4:03 PM > > > To: Exchange Discussions > > > Subject: Email philosophy 101 - Spam NDRs > > > > > > Let's say we get 1000 messages with invalid addresses into our spam > > > filter. > > > 950 of them will get caught as spam if we filter them. > > > 49 slip past the filter but shouldn't have. They're directory > > > harvesting > > > messages, invalid return addresses, and valid return addresses of > > > people > > > who didn't send the spam. > > > 1 is a message from one of our customers asking for directions, > that > > he > > > fat-fingered to MemmerService > > > > > > Should we send NDRs on the 49 spammy ones so that the customer gets > > his > > > NDR? Or should we silently drop his message so that we're not > sending > > > 49 > > > NDRs that we shouldn't? > > > > > > Please use a #2 pencil. > > > > > > > > > _________________________________________________________________ > > > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > > > Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange > > > To subscribe: > http://e-newsletters.internet.com/discussionlists.html/ > > > To unsubscribe send a blank email to leave-28404306- > > > [EMAIL PROTECTED] > > > Exchange List admin: [EMAIL PROTECTED] > > > To unsubscribe via postal mail, please contact us at: > > > Jupitermedia Corp. > > > Attn: Discussion List Management > > > 475 Park Avenue South > > > New York, NY 10016 > > > > > > Please include the email address which you have been contacted > with. > > > > > > _________________________________________________________________ > > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > > Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange > > To subscribe: http://e-newsletters.internet.com/discussionlists.html/ > > To unsubscribe send a blank email to leave-28405330- > > [EMAIL PROTECTED] > > Exchange List admin: [EMAIL PROTECTED] > > To unsubscribe via postal mail, please contact us at: > > Jupitermedia Corp. > > Attn: Discussion List Management > > 475 Park Avenue South > > New York, NY 10016 > > > > Please include the email address which you have been contacted with. > > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange > To subscribe: http://e-newsletters.internet.com/discussionlists.html/ > To unsubscribe send a blank email to > [EMAIL PROTECTED] > dl.sparklist > .com > Exchange List admin: [EMAIL PROTECTED] > To unsubscribe via postal mail, please contact us at: > Jupitermedia Corp. > Attn: Discussion List Management > 475 Park Avenue South > New York, NY 10016 > > Please include the email address which you have been contacted with. > > > ********************************************************************** > Have you clicked on yet? > www.nrc.govt.nz > ********************************************************************** > NORTHLAND REGIONAL COUNCIL > > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. 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