Well, it's very unlikely that the messages are disappearing into the bit bucket all on their own. Either the sender isn't seeing the NDRs due to a poorly configured system on their end, or your system is tar-pitting them or your anti-spam system is dropping them or.... You're not really giving us enough info to derive an answer from. What testing have you done? What questions have you asked the sender and/or the mail admin at the sending domain? Brian Pituley Director of Information Technology T: 408-441-3611 F: 408-441-8405 E: bpituley@xxxxxxxxxxxxxxxx From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Frank Ventura Sent: Thursday, November 29, 2007 2:51 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: [sbs list] Not getting email from one particular domain No errors at all, at least they claim. Frank From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Brian Pituley Sent: Thursday, November 29, 2007 5:41 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: [sbs list] Not getting email from one particular domain Are the senders getting error or bounce messages? Brian Pituley Director of Information Technology T: 408-441-3611 F: 408-441-8405 E: bpituley@xxxxxxxxxxxxxxxx From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Frank Ventura Sent: Wednesday, November 28, 2007 4:46 AM To: exchangelist@xxxxxxxxxxxxx Cc: sbs2k@xxxxxxxxxxxxxxx Subject: [ExchangeList] [sbs list] Not getting email from one particular domain Hi all, I have Exchange running under Small Business Server 2003 on a Dell server. There is one domain that anyone in our company cannot receive email from. Is there somewhere in Exchange that lists blacklisted domains. If so how do I find it, if not what would cause us to get mail from all other domains except this particular one. I can get email directly from this domain if I use my home email account. 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