IBM AH0QXML User Guide - Page 56
provides an SMTP Reply code, 554 along with the reason for the failure
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You can stop mail from entering your environment by using the Deny messages from the following internet addresses/domains field. If your company has domain names that it will not accept mail from, you could add these domain names here. You can also deny mail from certain individuals by adding their explicit internet address to the Deny field. If you want only specific users to send mail into your server, you could utilize the "Allow messages only from the following internet addresses/domains" field. Allowing or denying addresses using the inbound sender controls works very similarly to using Server Mail rules. To determine which method is best for your environment, consider the following differences: If you deny messages from certain Internet addresses or domains using the inbound sender controls, the sending server will receive a 554 SMTP response and will not be allowed to transfer the message. The message is never accepted by the Domino server, nor is it written to mail.box. The delivery failure report that's generated when a message is denied using inbound sender controls is shown in Figure 4-7. Notice the failure reason provides an SMTP Reply code, 554 along with the reason for the failure, "Mail from rejected for policy reasons." Figure 4-7 Delivery Failure Report with 554 SMTP response code If you deny messages from certain Internet addresses or domains using a server mail rule, (with the don't deliver message action), as the administrator, you can choose either to send an NDR (Non-Delivery Report) or to silently delete the message. The delivery failure report in Figure 4-8 was generated using a server mail rule. Notice that the reason for failure only indicates "Message rejected for policy reasons," but does not make note of the sender's address. 44 Lotus Domino 6 spam Survival Guide for IBM eServer
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