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Knowledgebase: Steadfast Cloud Platform
Enterprise Anti-Spam Filtering
Posted by Kevin Stange, Last modified by Karl Zimmerman on 05 June 2011 03:35 AM
On February 11th, 2011, we deployed a new filtering solution based on SpamExperts, which provides additional redundancy and IPv6 support, as well as much more granular control over filtering and user access. This documentation explains some of the core features and how to use them.

Basic Setup

It's now possible for all customers to add and remove domains without administrator assistance. To do this, go to "Domains" and select "Add domain" then specify the new domain and route you wish to add. Once this is done, you can begin using the filtering system by changing the MX records for your domains as follows:

<domain>. <TTL> IN MX 10 a.spamfilter.steadfast.net.
<domain>. <TTL> IN MX 10 b.spamfilter.steadfast.net.
  • <domain> should be the domain name. Some DNS systems expect the domain to be left blank.
  • <TTL> can be left to your DNS system's default or any value of your preference.
  • The value of 10 is the priority and can be changed at your discretion as well
  • Both records should be left at the same priority.

Per-domain and per-mailbox user creation

It's now possible to create per-domain and per-mailbox user accounts. By selecting "Permissions" under the "Users" heading, it is possible to create restrictions on which features the user accounts may access.

Per-mailbox users are created by selecting "Webinterface users" under the "Users" heading. These users may:

  • Access mailbox-level email logs and quarantine.
  • Configure mailbox-level scheduled protection reports.
  • Report spam that was missed by the filter.
  • Mark the mailbox as whitelisted from filtering.

Per-domain users are created by selecting "Manage domain users" under the "Users" heading. These users may:

  • Manage domain filtering and delivery policies.
  • Manage whitelists and blacklists.
  • Access domain-level email logs and quarantine.
  • Configure domain-level and mailbox-level scheduled protection reports.
  • Report spam that was missed by the filter.
  • Manage per-mailbox "webinterface users"

Quarantine Access and Spam Reporting

There are three ways a user can access his quarantine and report spam:

  • By logging into the web interface.
  • Setting up scheduled protection reports
  • By setting up the IMAP quarantine system.

Any user with a domain or webinterface (per-mailbox) account can access any method.

Using the Web Interface

When logged into the web interface, a domain or webinterface user can use the "Report Spam" or "Spam Quarantine" options to manage the quarantine and report misclassified messages.

Setting up Protection Reports

Domain-wide protection reports can be set up by domain users by selecting "Manage Settings" under the "Protection Report" heading. Per-mailbox protection reports can be set up by either domain or webinterface users by selecting "Manage recipients" under "Protection Report." These reports are emailed to the user on the schedule indicated and individual messages can be released via a link next to each listed message.

Using the IMAP System

To set up the IMAP system, a user may simply add an IMAP account to their favorite email client with the following details:

  • Server: spamfilter01.steadfast.net
  • Username: domain name or webinterface user name (email address)
  • Password: user's password

Three mailboxes will be visible:

  • Caught
  • Release
  • Spam

"Caught" is a browseable folder that shows all quarantined messages. "Release" and "Spam" cannot be browsed. To release any caught messages that is not spam, a user can simply drag the message from "Caught" to "Release" and it will be delivered normally. To mark any uncaught message as spam, simply drag it from a usual mailbox to the "Spam" folder.

Either action will report the message as misclassified so that future messages may be filtered more correctly.

Further Reading

Extensive documentation for the SpamExperts appliance is available via the official Wiki. Please be aware that not all features listed are available on our filtering system. If you have any questions or need assistance, please contact support and we'll be happy to assist you.

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