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+--- Thread: Spam Filtering Software Upgrade (/showthread.php?tid=59)
Spam Filtering Software Upgrade - webnetics - 12-11-07
This only applies to customers who are currently using our spam bouncing software on there account(s).
Some of our customers may have noticed email messages “ Warning: message 1IqS2i-0004uK-7I delayed 24 hours”. This is due to our mail server being upgraded, with new spam filtering software. One of the new features is an e-mail Grey listing service.
Grey Listing works by imposing a short delay on the first e-mail we receive from each sender: when our server receives the mail it asks the sending mail server to try again in 5 minutes. This is something which all genuine mail servers will do automatically, but which compromised PCs used for sending spam often ignore.
Once the first mail is successfully delivered we then remember that sender and let further mails through automatically, without any delay at all. And a sender only has to be approved once across all users whose mail we process and so you benefit from the grey listing we do for our other users, and if somebody mails you (or any other user on our system) at least once a month then he/she will never be subject to any further grey listing delays.
Also we have placed restriction on email attachment sizes, this now has a limit of 8m per email, if the file size is greater than this. The email will be rejected by our mail server.
Since we have upgraded our spamming software. This has now produced some fantastic results in terms of eliminating time-consuming and sometimes dangerous junk mail from users inboxes.