Security Settings

The Security Settings in Mailster allow you to safeguard your campaigns and signups by adding various layers of protection. Below is an overview of the available options and how to configure them.

General Checks

General checks help validate and verify email addresses and domains before allowing them to sign up.

  • Check MX Record: Verifies that the domain has an existing MX record, which is essential for delivering emails. If no MX record is found, it indicates that the domain has no configured mail server.
  • Validate via SMTP: Connects to the SMTP server of the domain to confirm that the email address actually exists. This reduces the risk of using fake or invalid addresses.
  • Honeypot: Adds an invisible input field to catch bots trying to fill out all fields during signup.
  • IP Check: Prevents a signup from the same IP address if there is already a pending subscriber from that IP. This is useful for reducing spam and duplicate signups.

Antiflood

Sets a time limit to prevent repeated subscriptions from the same IP address within a specified period. If set to 10 seconds, users cannot subscribe multiple times from the same IP within 10 seconds.

Auto Click Prevention

This option adds an extra redirect when links in emails are clicked too quickly. Some automated email security systems might click on every link to test them, which could skew campaign metrics. Enabling this option helps reduce false clicks. Read more here.

Disposable Email Provider

Rejects email addresses from temporary or disposable email providers (DEP), which are often used for spam or fraudulent activities.

Blocked Email Addresses

Allows you to manually block specific email addresses. Enter one email address per line.

Blocked Domains

Blocks signups from specific domains. Enter one domain per line to prevent any email addresses from those domains from signing up.

Blocked IP Addresses

Block specific IP addresses or IP ranges from signing up. Use CIDR notation or IP ranges as needed.

Example:

192.168.1.0-192.168.1.100
192.168.*.*
192.169.1.0/24
192.168.0.95

Blocked Countries

Block signups from specific countries by entering their ISO 3166-1 two-letter country codes, separated by commas.

Examples:

US, UK, DE, AT, CH, BR

Allowed Countries

Restrict signups to specific countries by entering their country codes, similar to the blocked countries setting. Leave blank to allow all countries.

Examples:

US, UK, DE, AT, CH, BR

Safe Domains

List of domains that bypass all the above rules and are always allowed to sign up. One domain per line.

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