Your server's SMTP virtual server or IMS communicates with the Yahoo! server. The Yahoo! server rejects the RCPT TO: because the recipient doesn't exist. No message was sent; the conversation was rejected early on. Therefore your server issues the NDR.
To everyone who wants to understand SMTP: Read RFCs 821 and 822 (and/or 2821 and 2822) and understand them. These concepts become pretty clear. The RFCs really aren't a that hard a read. Ed Crowley MCSE+I MVP Tech Consultant Compaq Computer "There are seldom good technological solutions to behavioral problems." -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Hotmail Work Sent: Monday, December 03, 2001 6:14 AM To: Exchange Discussions Subject: Re: Stopping bad email addresses at the gates While it may not be standard operations, I'm trying to bounce spam and junk mail before it gets transmitted. For example, here's the message I get back when you try to send to an invalid yahoo.com account: A mail message was not sent due to a protocol error. 554 delivery error: dd This user doesn't have a yahoo.com account ([EMAIL PROTECTED]) - mta548.mail.yahoo.com The message that caused this notification was: This is being sent to me from my own server, yahoo never accepted the message. Similar things happen with Hotmail and other ISPs. I'm looking for ways to keep the junk from ever arriving. JR ----- Original Message ----- From: "Roger Seielstad" <[EMAIL PROTECTED]> To: "Exchange Discussions" <[EMAIL PROTECTED]> Sent: Friday, November 30, 2001 7:43 AM Subject: RE: Stopping bad email addresses at the gates > What do you hope to accomplish? That's how SMTP is supposed to work - if > you're authoritative for a domain, you need to accept all mail for that > domain, and then send NDRs for bad addresses. I believe that's all covered > in RFC 2821 and 2822. > > ------------------------------------------------------ > Roger D. Seielstad - MCSE MCT > Senior Systems Administrator > Peregrine Systems > Atlanta, GA > http://www.peregrine.com > > > > -----Original Message----- > > From: Jim Ross [mailto:[EMAIL PROTECTED]] > > Sent: Friday, November 30, 2001 8:29 AM > > To: Exchange Discussions > > Subject: Stopping bad email addresses at the gates > > > > > > Hello, > > Is there a way to bounce bad Internet messages before they > > get delivered? > > If I'm understanding the flow correctly, the IMC accepts any message > > coming in and hands it off to the MTA. The MTA says "I don't have a > > mailbox for that person" and sends back out a non-delivery > > announcement, > > and in our case also sends a copy to the postmaster for > > review. Can we > > stop those messages at the Internet connector? We are > > running 5.5 with a > > single small organization right now but will be going to E2K soon. > > > > Thank you, > > JR > > > > _________________________________________________________________ > > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > > Archives: http://www.swynk.com/sitesearch/search.asp > > To unsubscribe: mailto:[EMAIL PROTECTED] > > Exchange List admin: [EMAIL PROTECTED] > > > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Archives: http://www.swynk.com/sitesearch/search.asp > To unsubscribe: mailto:[EMAIL PROTECTED] > Exchange List admin: [EMAIL PROTECTED] > _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
