Comodo Antispam Gateway

Note: Under default conditions, CASG will filter all incoming mails to all domains that have been enabled in the ‘Domains’ area.

Rule Type

Description

Notes

Domain Rules ('Create Rule...')

Create granular rules to blacklist, whitelist or forward mail based on one or more criteria.

Criteria include sender, sender mail server, recipient, relay server, subject line and suspicious attachment.

TLD & gTLD Rules

Allow or block mails based on top level domain.

Mail from all TLDs is allowed by default. This interface allows you to block selected TLDs.

Recipient Whitelist

Always allow mail sent to these recipients.

For example, CASG will allow/block mails to/from specific_user@example.com, but will filter as normal email to/from any_other_users@example.com

You can bulk import email addresses from .csv or add manually.

Sender Whitelist

Always allow mail received from these senders.

Recipient Blacklist

Always block mail sent to these recipients.

Sender Blacklist

Always block mail received from these senders.

Whitelist senders per user

Always allow mail from specific email addresses to specific users.

For example, CASG will allow/block mails from specific_sender@example.com to specific_recipient@your_domain.com, but will continue to filter mail from specific_sender@example.com to everybody_else@your_domain.com

You can bulk import email addresses from .csv or add manually.

Blacklist senders per user

Always block mail from specific email addresses to specific users.

General Advice

• If you are troubleshooting issues with a particular email address, please check all interfaces listed under 'Domain Rules'.
  

• Rule priorities can be summarized as follows:
  

1. Email Size Restriction

2. Domain Whitelist rules

3. Sender/Recipient Whitelist

4. Domain Blacklist rules

5. Sender/Recipient Blacklist

6. TLD & gTLD blacklist rule

7. Per user White list

8. Per user Black list

9. Email Blocked Extensions

CASG will stop applying rules on first match (if any).

• 'Email Size Restrictions' have a higher priority than domain rules. CASG will still block mails that exceed 'Email Size Restriction' regardless of any rules.

• 'Email Blocked Extensions' have a lower priority than domains rules. CASG will not stop mails containing a blocked extension if there is a whitelist rule which green-lights the message.

• Whitelist domains rules take precedence over blacklist domain rules.

• Whitelist/blacklist rules in the domain rules section take precedence over 'per user' whitelist/blacklist rules.