I'm guessing that spammers send an empty messages and then through one hour send spam when all doors are open.
By default delay is 1 hour. I think it too long period, which may confuse most senders that the mail from the server stuck in queue for a hour. Generally, good idea. Regards, Dmitri Elgin, http://imailzip.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, August 24, 2004 4:03 PM To: [EMAIL PROTECTED] Subject: [IMail Forum] Experience with "greylisting" antispam? Does anyone have experiences with "greylisting" as described on http://projects.puremagic.com/greylisting/ ? In short, this is a method to block spam by a) Read and Store SenderIP/SenderAddress/RecipientAddress triplet b) Deny mail with a temporary SMTP error (451 Try later) c) Accept same mail when it is retrying after a specified waiting period d) Accept same triplets for a specified time As commercial spam is commonly sent by fire-and-forget engines, it will not be delivered. Of course, this must be implemented on the MTA level. So far, I know of only one Win32 based antispam product which implements this method (Xwall). Marius To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
