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Xcitium Secure Email Gateway MSP

Xcitium Secure Email Gateway MSP

Admin Guide

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Domain Management > Manage A Domain > Domain Rules
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  • Appendix 1 - CSEG Error Codes
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  • About Xcitium Security Solutions

Domain Rules

 

  • Create granular filtering rules for each domain in order to blacklist, whitelist or forward mails.

    • Rules can be based on sender, recipient, source/destination server, subject line, suspicious attachments and more.




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


    The following table offers more details on each rule type:


    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, CSEG will allow/block mails to/from [email protected], but will filter as normal email to/from [email protected]



    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, CSEG will allow/block mails from [email protected] to [email protected]_domain.com, but will continue to filter mail from [email protected] to [email protected]_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

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

    • 'Email Size Restrictions' have a higher priority than domain rules. CSEG will still block mails that exceed 'Email Size Restriction' regardless of any rules.
    • 'Email Blocked Extensions' have a lower priority than domains rules. CSEG 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.


    Click the following links for more details.

    • Rules
    • TLD and gTLD Rules
    • Recipient Whitelist
    • Sender Whitelist
    • Recipient Blacklist
    • Sender Blacklist
    • Whitelist Senders Per User
    • Blacklist Senders Per User

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