IBM AH0QXML User Guide - Page 34
SMTP Configuration Checking Sequence, Domino SMTP Listener checks Inbound Sender Controls
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SMTP Configuration Checking Sequence Lotus Domino 6 for Linux (SMTP) Server STEP 2 STEP 4 STEP 6 STEP 8 STEP 10 STEP 12 STEP 1 STEP 3 STEP 5 STEP 7 STEP 9 STEP 11 Domino SMTP Server listens for Firewall connection requests on port 25 SMTP Client/Server requests inbound connection into Domino SMTP Server on port 25 Figure 3-3 Communication sequence for incoming SMTP mail The general communication sequence of incoming SMTP mail is as follows: 1. Originating SMTP server makes a connection request to Domino SMTP server on the TCP/IP port. 2. Domino SMTP server responds to the connection request and allows or denies connection based on SMTP Inbound Controls on Server Configuration document. 3. Originating SMTP server sends the MAIL FROM containing the sender's internet address. 4. Domino SMTP Listener checks Inbound Sender Controls, comparing contents of the MAIL FROM. If the maximum message size is enabled on the server and the client has provided the message size as a parameter on the mail from command, the inbound file size restrictions are performed (messages that are too large are rejected). 5. Originating SMTP server sends the RCPT TO containing the internet address of the intended recipient. (Note: Steps 5 and 6 are repeated for additional recipients.) 6. Domino SMTP Listener checks Inbound Intended Recipients Controls, comparing contents of the RCPT TO. If intended recipient is not a local user, it checks Inbound Relay Enforcement and Inbound Relay Controls, comparing contents to the RCPT TO. 22 Lotus Domino 6 spam Survival Guide for IBM eServer