I am getting these emails bounced from my server for this one recipient. I use AppRiver to pre-clean my email. They are telling me that my server is blocking the mail. How do I let this users emails into our organization? Here is what AppRiver saw from there logs regarding this bounced message: 22:08:03.593 2 QUEUE([170660043]) from <sender@senders.com>, 20897918 bytes 22:08:03.593 4 QUEUE([170660043]) enqueued, nTotal=6619<o:p></o:p> 22:08:03.593 4 QUEUE([170660043]) opened, 25 open<o:p></o:p> 22:08:03.593 4 QUEUE([170660043]) applying server rules<o:p></o:p> 22:08:03.593 4 SMTP([67.X.X.X]) [170660043] enqueueing (new)<o:p></o:p> 22:08:03.593 2 QUEUE([170660043]) enqueued<o:p></o:p> 22:08:03.593 4 QUEUE([170660043]) closed, 24 open<o:p></o:p> 22:08:03.593 2 SMTPI-483297([10.242.X.X]) [170660043] received, 20897918 bytes<o:p></o:p> 22:08:03.593 4 SMTPI-483297([10.242.X.X]) rsp: 250 170660043 message accepted for delivery<o:p></o:p> 22:08:03.765 4 SMTP-466214([67.X.X.X]) [170660043] sending<o:p></o:p> 22:08:03.827 1 SMTP-466214([67.X.X.X]) [170660043] return-path rejected, got:500 Firewall Error<o:p></o:p> 22:08:03.827 4 SMTP([67.X.X.X]) [170660043] batch failed<o:p></o:p> 22:08:03.827 1 DEQUEUER [170660043] SMTP([67.X.X.X])Ourreceiver@ourdomain.com failed: return-path address <sender@senders.com> rejected by 67.X.X.X:\r\n 500 Firewall Error<o:p></o:p> Thank you in advance for any assistance given on this issue. James

your anti-spam appliance is telling you that the sender's return path in the message is not a valid domain that the sender is responsible for or it doesnt match the MAIL FROM: in the SMTP conversation. The return-path essentially defines where NDRs go to for the message. ( Some anti-spam products also drop messags with a blank return-path <>) If you really want to allow these from this domain, whitelist their ip addresses for their sending servers ( or have the senders use a valid SMTP domain if that is the case)

We dont use an anti spam appliance. We just use AppRiver- I dont want to just whitelist their ip addresses as it is a very large company, and would entail who knows how many servers.

We dont use an anti spam appliance. We just use AppRiver- I dont want to just whitelist their ip addresses as it is a very large company, and would entail who knows how many servers. Ok, AppRiver = anti-spam . The sender should have gotten a NDR telling them the same thing. I would contact AppRiver support for more info and they can give you their standard verbage on why its being rejected and how to resolve with the original sender.