Relay Page
Use this page to allow traffic through the relay, turn on antimalware and configure how to relay mail.
Navigation: EMAIL > SMTP > Relay.
Enable mail relay |
Turns on relaying after configuring incoming and outgoing relaying. |
Maximum email size (MB) |
The maximum email size, in megabytes, that is accepted. Any email larger than this limit are rejected. |
Maximum bounce size (KB) |
The maximum size of an email, in kilobytes, used in a bounce email. |
Time to hold undeliverable mail |
The amount of time an email is held in the queue if it can't be sent. An attempt to send all email that's held in the queue is made periodically. |
Enable transparent SMTP relay |
Captures outgoing email and relays it. |
Enable anti-malware scanning |
Turns on antimalware scanning for relayed email. |
Action to perform on malware |
Determines what to do if malware is found in relayed email:
Drop (discard) email |
Discard the email, without notifying the sender or intended recipient. |
Bounce email (warn sender) |
Return the email to the sender, along with a warning message. |
Neutralize email |
Send a warning email to the recipient, with the original email as an attachment. |
Allow email delivery |
Allow the email to be delivered, and the malware is logged. |
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Port 1.57 Solutions |
The interface(s) SMTP traffic will be transparently captured from |
Port 3 S2 Imaging Network |
Port 4 S4/S8 Imaging Network |
Port 5 S10/S14 Imaging Network |
IP exception list |
Any IP addresses, subnets or ranges that should not be transparently proxied. |
Advanced » |
Expands the view to show the following sections and options. |
Use system hostname |
Uses the SMTP hostname when relaying email. |
User defined hostname |
Your defined host name to use when relaying email. |
Enable relay host |
Turns on the relay host to send outgoing email to another relay within an existing email infrastructure. |
Relay host |
The IP address or hostname of the relay. |
Username (if applicable) |
The username, if needed by the remote relay. |
Password |
The password, if needed by the remote relay. |
Use strict HELO checks |
Ensures that the initial communication between a connecting SMTP client and the email relay is valid. |
Sender domain validity |
Checks that the sender domain is formatted correctly and has a real IP address. |
Recipient domain validity |
Checks that all recipient domains are formatted correctly and have real IP addresses. |
External sender domain spoofing |
Checks if the sender of incoming email is falsely using an internally relayed domain in their From address. Emails are rejected if the sender’s email address purports to be from a domain listed on the incoming page, but the sender’s IP address cannot be found on the outgoing page. |