The Netwalker Blog

Archive for January, 2008

Antispam Add-On Service for Web Hosting Customers

Wednesday, January 2nd, 2008

I am excited to announce that we now offer a free Antispam add-on for our web hosting customers! This new service is powered by Interjuncture’s Easy Antispam service and covers all email accounts on any domain for which the service has been enabled. The service is absolutely free, but is only available for web hosting customers. If you are an existing web hosting customer and would like to have the service enabled on your domain(s), please contact us today! Please note that this service is not available for customers with catch-all email accounts. Please feel free to contact us if you are unsure if this applies to you or if you know you have a catch-all but are unsure if you need it.

Below is additional information regarding this new service.


Easy Antispam blocks spam at two levels.

First, we block mail using realtime blackhole lists (RBLs). These messages are blocked at the transmission level and are never fully received, so they cannot be quarantined.

Second, we pass mail through the MIQ Antispam/Antivirus engine. If it is blocked as a virus, it is deleted and not quarantined. If it is blocked as spam, it is placed into quarantine for 3 days.

Once per day each email user will receive a Quarantine Digest email containing any new mail that was placed in quarantine since the last digest. If there were no messages quarantined, a digest will not be received. The user can view the message, release the message to their Inbox, or release and report the message as “not spam” to the MailFoundry antispam team for further review.

Users may also access their quarantines on-demand via a web interface or via RSS.


The various message classifications used by Easy Antispam are:

Ham – All mail considered clean by the system. The stuff you want.

Spam – (aka UCE) Unsolicited mail.

Virus – Message that contain a virus.

RBL – A message from a server that is listed on the Remote Block List.

RPDNS – (Reverse Path DNS) Mail from a domain that does not have the appropriate Mail eXchange or A records in DNS to send a response back to.

RFC – Messages that are blocked due to improper formatting of the message.

RP Sanity – A message that is blocked due to the sending server having an invalid DNS record such as 127.0.0.1 (aka localhost).

Size Ext – Messages that are blocked by the specified Size limits.