D-Link DSR-1000AC User Manual - Page 181

Section 8 - Security SMTP ALGs Path: Security > Firewall > ALGs > SMTP ALGs Simple Mail Transfer Protocol (SMTP) is a text based protocol used for transferring email between mail servers over the Internet. Typically the local SMTP server will be located on a DMZ so that mail sent by remote SMTP servers will traverse the router to reach the local server. Local users will then use email client software to retrieve their email from the local SMTP server. SMTP is also used when clients are sending email and SMTP ALG can be used to monitor SMTP traffic originating from both clients and servers. 1. Click Security > Firewall > ALGs > SMTP ALGs tab. 2. Toggle Status to ON. 3. Enter the port at which the SMTP packets are inspected. 4. Click Save. D-Link DSR-Series User Manual 168