Can somebody share his implementation/ opinions about greylisting. It seems like good way of lowering server load.
Best regards,
Piotr
Greylisting - how to?
We don't actually recommend using greylisting, here's why:
Even when set up "correctly", you will most likely lose legitimate email. You will not receive any email from sources that send out email using port 25 instead of the local MTA, e.g. many webmail scripting products and PHP forms, etc. For example, when mail is sent directly from a script (php or cgi) there is no queuing mechanism for it and so if it is rejected initially it will probably never be delivered.
We also don't like the concept of giving a false error, and especially don't like the idea of an MTA having to do twice the work, therefore twice the resources, in trying to deliver an email to a server which is using greylisting.
Regards,
Sarah
Even when set up "correctly", you will most likely lose legitimate email. You will not receive any email from sources that send out email using port 25 instead of the local MTA, e.g. many webmail scripting products and PHP forms, etc. For example, when mail is sent directly from a script (php or cgi) there is no queuing mechanism for it and so if it is rejected initially it will probably never be delivered.
We also don't like the concept of giving a false error, and especially don't like the idea of an MTA having to do twice the work, therefore twice the resources, in trying to deliver an email to a server which is using greylisting.
Regards,
Sarah
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nabuhonodozor
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- Joined: 29 Oct 2007, 07:01