Connection Rule examples
This article provides you with the components and settings required to create a specific Connection Rule. For instructions on how to create a rule, refer to Connection Rules.
IP Geo-location connection rule
Since users may have location requirements, we do not provide a default Geolocation Rule. Create this custom rule to detect the location of the connecting IP address and restrict or allow connections from specific areas.
To allow emails from a specific domain, while still denying emails from that domain's country of origin, you need to Create a new Custom Rule RegEx data:
Go to Products > Email Security > Custom Rule Data
Click the Add New button and select Rule Data. Give it a descriptive name (e.g. No Spam filtering) and click Update.
Add the domains you want to be allowed to connect, each on a separate line:
You can then create the rule:
Rule component | Component type | Match Type | Condition value |
|---|---|---|---|
Condition | Matches |
| |
Condition | Does not Match | Name of the previously created Custom Rule Data. | |
Condition | Matches | Select one or more countries you want to restrict. | |
Condition | Does Not Match | GeoIP exclusion for release servers. This excludes the email release servers from being rejected with options used in the Sender IP Location. | |
Final Action | Value |
|
Note
Unless the Active button is set to On, the rule will not be processed.
Decide the priority of the rule in relation the other existing rules and drag it to the appropriate position in the Connection Rules window.
Rejecting large emails
By default, Email Security accepts emails up to 50Mb inbound or outbound. This is done through the Maximum Mail Size default standard rule.
Warning
NDR's are not sent from your Mail Server (Domain Route) back to the Internet if your server rejects the message and Email Security routes it. This is due to security policies that help to avoid being blacklisted due to backscatter and NDR spam.
If your mail server (Domain Route) does not accept messages of this size, you can reject the message at the point of SMTP connection. This will make the connecting server create a Non-Delivery Report (NDR) for the sender.
Tip
If you create a Message Rule to perform the same function, the sender will not be advised that the email was not received by the recipient.
To change the Maximum Mail Size connection rule follow the steps below:
Go to Products > Email Security > Connection rules.
Double-click the rule's title or click on the Change Rule
button.Note
The Rule might be called Large Files on your system.
Find the Email Size condition, and click Configure.
Choose a new limit from the Condition Value.
Click the Save
button.