Smtp Forwarding - peplink Pepwave MAX Series User Manual

DNS Forwarding
Custom Service
Forwarding

21.4.1 SMTP Forwarding

Some ISPs require their users to send e-mails via the ISP's SMTP server. All outgoing SMTP
connections are blocked except those connecting to the ISP's. Pepwave routers support intercepting and
redirecting all outgoing SMTP connections (destined for TCP port 25) via a WAN connection to the
WAN's corresponding SMTP server.
To enable the feature, select Enable under SMTP Forwarding Setup. Check Enable Forwarding for
the WAN connection(s) that needs forwarding. Under SMTP Server, enter the ISP's e-mail server host
name or IP address. Under SMTP Port, enter the TCP port number for each WAN.
The Pepwave router will intercept SMTP connections. Choose a WAN port according to the outbound
policy, and then forward the connection to the SMTP server if the chosen WAN has enabled forwarding.
If the forwarding is disabled for a WAN connection, SMTP connections for the WAN will be simply be
forwarded to the connection's original destination.
If you want to route all SMTP connections only to particular WAN connection(s), you should create a custom rule in
outbound policy (see Section 14.2).
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When this option is enabled, all outgoing DNS lookups will be intercepted and redirected to
the built-in DNS name server. If any LAN device is using the DNS name servers of a WAN
connection, you may want to enable this option to enhance the DNS availability without
modifying the DNS server setting of the clients. The built-in DNS name server will distribute
DNS lookups to corresponding DNS servers of all available WAN connections. In this case,
DNS service will not be interrupted, even if any WAN connection is down.
When custom service forwarding is enabled, outgoing traffic with the specified TCP port will
be forwarded to a local or remote server by defining its IP address and port number.
Note
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