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Mail Gateway

Mail Gateway is an email security service that sits between internal email servers and external networks. Incoming and outgoing email passes through the gateway, where messages can be inspected and filtered for spam, malware, and other threats.

Definition

Use Mail Gateway to protect organizational email communication, manage domains, configure sender policies, generate DKIM selectors, release quarantined messages, and review gateway change history.

Features

Feature Description
Change history Track and view Mail Gateway changes from Cloud Portal.
Whitelist senders Add or remove allowed email addresses or IP addresses.
Blacklist senders Add or remove blocked email addresses or IP addresses.
Personal quarantine release Search for personal quarantine messages and release selected emails.
DKIM key selector generation Generate a key selector for a domain to add to the DKIM record.
Domain management Create new domains or add domains to Mail Gateway.

Use Cases

  • Email encryption.
  • Data loss prevention.
  • Malware protection.
  • Spam filtering.

Prerequisites

To create a new domain:

  • Map the MX record to SITE Cloud MX records.
  • Create an incoming rule from Mail Gateway IPs to Mail Server VM or load balancer IPs.
  • Create an outgoing rule from Mail Gateway IPs to Mail Server VM or load balancer IPs.

Step-by-Step Guide

Open Mail Gateway

  1. Open Security.
  2. Open Mail Gateway.

Access or Create a Domain

For an existing domain, click the domain name to open its management interface.

To create a new domain:

  1. Click Create.
  2. Choose the tenant.
  3. Choose the business group.
  4. Select the number-of-users range.
  5. Enter the new domain.
  6. Add a description.
  7. Enter primary SMTP server IPs for inbound email.
  8. Enter secondary SMTP server IPs for inbound email.
  9. Enter the allowed SMTP server IP list for outbound email.
  10. Click Submit.

Generate a DKIM Key Selector

  1. Open the domain.
  2. Open the DKIM tab.
  3. Click Create.
  4. Enter a key selector name.
  5. Click Submit.
  6. Open the three-dot menu.
  7. Click Activate DKIM file.
  8. Confirm the generated key selector.
  9. Download the DKIM file.
  10. Add it to the client DNS record.

Configuring Mail Gateway Policies

The Policy Builder manages rules that control email traffic flow for security, compliance, and email management.

Policy Builder Features

Feature Description
Spam prevention policies Configure spam filtering controls.
Virus prevention policies Configure virus detection, attachment scanning, and filtering.
Quarantine actions Configure how users interact with user quarantine.
Policy rule interface Manage policy rules from the portal.
Compliance and security Enforce policies for regulatory compliance.

Access Policy Builder

  1. Open Mail Gateway.
  2. Select the domain.
  3. Open the Policies tab.

Customize Policies

Policy Builder supports:

Category Purpose
Spam Prevention Configure spam controls.
Virus Prevention Configure virus controls.
Resources Configure user-quarantine email actions.

After configuring policies, click Apply Changes.

Use Set to SITE Cloud Defaults to revert policy settings to the default configurations provided by SITE Cloud.

Tip

Each policy includes a descriptive paragraph, and action descriptions appear on hover.

Managing Quarantine Policies

Open Mail Gateway, select the domain, open Policies, and navigate to Resources.

Setting Enabled behavior Disabled behavior
Send Quarantine Report Users receive an email containing their quarantine report. Users do not receive quarantine report emails.
Email Release Users can release emails directly from the quarantine report, when Send Quarantine Report is enabled. Users receive the report without release actions, or receive no report if Send Quarantine Report is disabled.

Release Personal Quarantine Emails

  1. Open the Quarantine Emails tab.
  2. Enter the email address.
  3. Select the quarantined email to release.
  4. Click Release.

Managing Sender Lists

  1. Open the Blacklist tab.
  2. Click Add Policy.
  3. Select whether to block by email address or IP address.
  4. Enter the email address or IP address.
  5. Add a comment for reference.

Examples:

  • Domain: *@test.sa
  • Email address: test1@test.sa
  • IP address: 192.168.1.1
  1. Open the Whitelist tab.
  2. Click Add Policy.
  3. Select whether to whitelist by email address or IP address.
  4. Enter the email address or IP address.
  5. Add a comment for reference.

Examples:

  • Domain: *@test.sa
  • Email address: test1@test.sa
  • IP address: 192.168.1.1

Track Updates and Modifications

Open the History tab to view changes made to the Mail Gateway domain.

Glossary

Term Meaning
DKIM DomainKeys Identified Mail, an email authentication method that uses a digital signature to verify sender legitimacy.
MX Record A DNS record that directs email to a specified mail server or gateway.
LB Load Balancer.
SMTP Simple Mail Transfer Protocol, the internet standard for transmitting email between servers.
SPF Record Specifies mail servers and domains authorized to send email for a domain.