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 New antyspam solution
Posted By: ResellerGuru Team On: 29 Dec 2007 21:42
Details Greylisting

We implemented today on all servers new antispam solution called greylisting.

Greylisting is a new weapon to use against spam in this great war being waged upon it. With this new shielding method, by which you may block out huge amounts of spam, you are sure to please your email clients!

In name, as well as operation, greylisting is related to whitelisting and blacklisting. What happen is that each time a given mailbox receives an email from an unknown contact (ip), that mail is rejected with a "try again later"-message (This happens at the SMTP layer and is transparent to the end user). This, in the short run, means that all mail gets delayed at least until the sender tries again - but this is where spam loses out! Most spam is not sent out using RFC compliant MTAs; the spamming software will not try again later.

In general, greylisting will not slow down the delivery of e-mail at all. Only the initial e-mail from an unrecognized sender will be delayed by the greylisting system, typically for a period of less than 1 hour. After this initial e-mail is passed to you, further messages from that recipient will be passed automatically by the greylisting system without delay.
 
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